{"id":6891,"date":"2024-09-06T15:11:51","date_gmt":"2024-09-06T08:11:51","guid":{"rendered":"https:\/\/nhiepanhvacongnghe.com\/?p=6891"},"modified":"2024-11-15T12:05:08","modified_gmt":"2024-11-15T05:05:08","slug":"sigma-28-105mm-f2-8-dg-dn","status":"publish","type":"post","link":"https:\/\/nhiepanhvacongnghe.com\/index.php\/2024\/09\/06\/sigma-28-105mm-f2-8-dg-dn\/","title":{"rendered":"Sigma 28-105mm F2.8 DG DN c\u00f3 nh\u1eefng g\u00ec ?"},"content":{"rendered":"\n

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Sigma 28-105mm F2.8 DG DN<\/a><\/strong> | \u0110\u00e1nh gi\u00e1 ART<\/p>\n\n\n\n

\u1ed0ng k\u00ednh zoom 24-105mm F4 \u0111\u00e3 c\u00f3 \u1edf kh\u1eafp m\u1ecdi n\u01a1i, nh\u01b0ng \u1ed1ng k\u00ednh zoom F2.8 lu\u00f4n c\u00f3 ph\u1ea1m vi zoom 24-70mm b\u1ecb h\u1ea1n ch\u1ebf h\u01a1n. \u0110i\u1ec1u \u0111\u00f3 \u0111\u00e3 d\u1eabn \u0111\u1ebfn v\u00f4 s\u1ed1 cu\u1ed9c c\u00e2n nh\u1eafc gi\u1eefa ph\u1ea1m vi zoom l\u1edbn h\u01a1n c\u1ee7a \u1ed1ng k\u00ednh 24-105mm ho\u1eb7c kh\u1ea9u \u0111\u1ed9 t\u1ed1i \u0111a l\u1edbn h\u01a1n c\u1ee7a \u1ed1ng k\u00ednh zoom 24-70mm. Nh\u01b0ng \u0111i\u1ec1u m\u00e0 m\u1ecdi ng\u01b0\u1eddi th\u1ef1c s\u1ef1 mu\u1ed1n l\u00e0, t\u1ea5t c\u1ea3 m\u1ecdi th\u1ee9. Canon l\u00e0 h\u00e3ng \u0111\u1ea7u ti\u00ean \u0111\u01b0a ra \u1ed1ng k\u00ednh 24-105mm F2.8 L IS USM Z, m\u1eb7c d\u00f9 \u1ed1ng k\u00ednh \u0111\u00f3 c\u00f3 gi\u00e1 3000 \u0111\u00f4 la v\u00e0 n\u1eb7ng 1,3 kg. Ch\u1eafc ch\u1eafn kh\u00f4ng ph\u1ea3i l\u00e0 “\u1ed1ng k\u00ednh d\u00e0nh cho m\u1ecdi ng\u01b0\u1eddi”. Nh\u01b0ng trong khi \u1ed1ng k\u00ednh m\u1edbi nh\u1ea5t c\u1ee7a Sigma \u00edt tham v\u1ecdng h\u01a1n m\u1ed9t ch\u00fat – Sigma 28-105mm F2.8 DG DN | \u1ed0ng k\u00ednh ART \u2013 gi\u00e1 ch\u1ec9 b\u1eb1ng m\u1ed9t n\u1eeda \u1ed1ng k\u00ednh Canon l\u00e0 1499 \u0111\u00f4 la M\u1ef9 . \u0110i\u1ec1u \u0111\u00f3 c\u00f3 khi\u1ebfn 28-105 DN tr\u1edf th\u00e0nh \u1ed1ng k\u00ednh zoom m\u1edbi \u0111\u00e1ng m\u01a1 \u01b0\u1edbc nh\u1ea5t hi\u1ec7n nay kh\u00f4ng? Ch\u00fang ta s\u1ebd kh\u00e1m ph\u00e1 c\u00e2u h\u1ecfi \u0111\u00f3 trong b\u00e0i \u0111\u00e1nh gi\u00e1 video c\u1ee7a t\u00f4i b\u00ean d\u01b0\u1edbi ho\u1eb7c trong b\u00e0i \u0111\u00e1nh gi\u00e1 v\u0103n b\u1ea3n sau.<\/p>\n\n\n\n

\u0110\u1ed1i th\u1ee7 c\u1ea1nh tranh h\u00e0ng \u0111\u1ea7u c\u1ee7a \u1ed1ng k\u00ednh 28-105 DN m\u1edbi tr\u00ean Sony g\u1ea7n nh\u01b0 ch\u1eafc ch\u1eafn s\u1ebd l\u00e0 Tamron 35-150mm F2-2.8 VXD. M\u1eb7c d\u00f9 ph\u1ea1m vi ti\u00eau c\u1ef1 r\u00f5 r\u00e0ng kh\u00f4ng gi\u1ed1ng h\u1ec7t nhau, nh\u01b0ng c\u1ea3 hai \u0111\u1ec1u l\u00e0 \u1ed1ng k\u00ednh hi\u1ec7u su\u1ea5t cao l\u00e0m m\u1edd ph\u1ea1m vi zoom truy\u1ec1n th\u1ed1ng. Tamron<\/a> l\u00e0 \u1ed1ng k\u00ednh ” n\u1ebfu t\u00f4i ch\u1ec9 c\u00f3 th\u1ec3 c\u00f3 m\u1ed9t \u1ed1ng k\u00ednh<\/em> ” c\u1ee7a t\u00f4i k\u1ec3 t\u1eeb khi ra m\u1eaft v\u00e0 t\u00f4i s\u1eed d\u1ee5ng b\u1ea3n sao c\u1ee7a m\u00ecnh r\u1ea5t nhi\u1ec1u. T\u00f4i s\u1ebd \u0111\u01b0a ra m\u1ed9t s\u1ed1 so s\u00e1nh v\u1edbi \u1ed1ng k\u00ednh Sigma m\u1edbi, v\u00ec t\u00f4i c\u1ea3m th\u1ea5y c\u1ea3 hai \u1ed1ng k\u00ednh \u0111\u1ec1u h\u01b0\u1edbng \u0111\u1ebfn c\u00f9ng m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng.<\/a><\/p>\n\n\n

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\"Sigma<\/a><\/figure>\n<\/div>\n\n\n

C\u00e1ch ti\u1ebfp c\u1eadn c\u1ee7a Sigma \u0111\u1ec3 gi\u1eef \u1ed1ng k\u00ednh n\u00e0y \u1edf k\u00edch th\u01b0\u1edbc h\u1ee3p l\u00fd th\u1ef1c s\u1ef1 l\u1ea5y m\u1ed9t trang t\u1eeb cu\u1ed1n s\u00e1ch c\u1ee7a Tamron; h\u1ecd \u0111\u00e3 b\u1eaft \u0111\u1ea7u \u1edf 28mm thay v\u00ec 24mm. Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, tr\u00ean th\u1ef1c t\u1ebf, \u0111\u1ea7u r\u1ed9ng 28mm c\u1ee7a Sigma v\u1eabn \u0111\u00e1nh b\u1ea1i \u0111\u1ea7u r\u1ed9ng 35mm c\u1ee7a Tamron, m\u1eb7c d\u00f9 r\u00f5 r\u00e0ng l\u00e0 Tamron c\u0169ng c\u00f3 th\u00eam 45mm \u1edf \u0111\u1ea7u tele. C\u00e1i n\u00e0o trong s\u1ed1 \u0111\u00f3 h\u1eefu \u00edch h\u01a1n c\u00f3 l\u1ebd ch\u1ee7 y\u1ebfu ph\u1ee5 thu\u1ed9c v\u00e0o nhu c\u1ea7u ch\u1ee5p \u1ea3nh c\u1ee7a ri\u00eang b\u1ea1n. 20mm b\u1ed5 sung ngo\u00e0i 85mm \u0111\u00f3 cung c\u1ea5p m\u1ed9t s\u1ed1 \u1ee9ng d\u1ee5ng ch\u00e2n dung th\u00fa v\u1ecb, cho ph\u00e9p b\u1ea1n n\u00e9n nhi\u1ec1u h\u01a1n m\u1ed9t ch\u00fat. Nh\u01b0ng trong khi Sigma t\u1eadp trung v\u00e0o c\u00e1c nhi\u1ebfp \u1ea3nh gia ch\u00e2n dung v\u00e0 phong c\u1ea3nh trong ho\u1ea1t \u0111\u1ed9ng ti\u1ebfp th\u1ecb c\u1ee7a h\u1ecd cho 28-105 DN, t\u00f4i ngh\u0129 th\u1ecb tr\u01b0\u1eddng th\u00fa v\u1ecb nh\u1ea5t th\u1ef1c s\u1ef1 l\u00e0 c\u00e1c nhi\u1ebfp \u1ea3nh gia s\u1ef1 ki\u1ec7n (\u0111\u1eb7c bi\u1ec7t l\u00e0 nhi\u1ebfp \u1ea3nh gia \u0111\u00e1m c\u01b0\u1edbi). Tamron 35-150mm l\u00e0 \u1ed1ng k\u00ednh tuy\u1ec7t \u0111\u1ed1i c\u1ee7a t\u00f4i cho t\u1ea5t c\u1ea3 c\u00e1c lo\u1ea1i s\u1ef1 ki\u1ec7n v\u00ec n\u00f3 bao g\u1ed3m c\u1ea3 ph\u1ea7n ch\u00ednh c\u1ee7a \u1ed1ng k\u00ednh zoom 24-70mm v\u00e0 70-200mm. 35mm th\u01b0\u1eddng \u0111\u1ee7 r\u1ed9ng \u1edf h\u1ea7u h\u1ebft c\u00e1c \u0111\u1ecba \u0111i\u1ec3m v\u00e0 kh\u1ea3 n\u0103ng chuy\u1ec3n \u0111\u1ed5i khung h\u00ecnh gi\u1eefa g\u00f3c nh\u00ecn r\u1ed9ng v\u00e0 tele c\u1ef1c k\u1ef3 h\u1eefu \u00edch. Sigma cho ph\u00e9p th\u1ef1c hi\u1ec7n c\u00f9ng m\u1ed9t c\u00e1ch ti\u1ebfp c\u1eadn theo m\u1ed9t c\u00e1ch h\u01a1i kh\u00e1c.<\/p>\n\n\n

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\"Sigma<\/figure>\n<\/div>\n\n\n

\u1ed0ng k\u00ednh Sigma 28-105 DN c\u00f2n b\u1ed5 sung th\u00eam m\u1ed9t s\u1ed1 kh\u1ea3 n\u0103ng l\u1ea5y n\u00e9t g\u1ea7n th\u00fa v\u1ecb v\u1edbi \u0111\u1ed9 ph\u00f3ng \u0111\u1ea1i 0,32x \u1edf \u0111\u1ea7u tele, cho ph\u00e9p ch\u1ee5p m\u1ed9t s\u1ed1 b\u1ee9c \u1ea3nh “macro”.<\/a><\/p>\n\n\n

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\"Sigma<\/figure>\n<\/div>\n\n\n

V\u1eady Sigma c\u00f3 th\u00e0nh c\u00f4ng kh\u00f4ng? Ch\u00fang ta s\u1ebd t\u00ecm hi\u1ec3u s\u00e2u h\u01a1n m\u1ed9t ch\u00fat \u0111\u1ec3 t\u00ecm hi\u1ec3u.<\/p>\n\n\n\n

X\u00e2y d\u1ef1ng v\u00e0 X\u1eed l\u00fd<\/h1>\n\n\n\n

Ti\u00eau chu\u1ea9n x\u00e2y d\u1ef1ng c\u1ee7a Sigma li\u00ean t\u1ee5c ph\u00e1t tri\u1ec3n v\u00e0 h\u1ecd r\u1ea5t ch\u1ee7 \u0111\u1ed9ng trong vi\u1ec7c b\u1ed5 sung c\u00e1c t\u00ednh n\u0103ng v\u00e0 c\u1ea3i ti\u1ebfn m\u1edbi. Nhi\u1ec1u c\u1ea3i ti\u1ebfn t\u00ednh n\u0103ng \u0111\u00f3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf xoay quanh kh\u1ea3 n\u0103ng quay video, r\u00f5 r\u00e0ng l\u00e0 ph\u1ee5c v\u1ee5 t\u1ed1t cho \u1ed1ng k\u00ednh m\u1edbi n\u00e0y. 28-105 DN v\u1ec1 c\u01a1 b\u1ea3n c\u00f3 t\u1ea5t c\u1ea3 c\u00e1c t\u00ednh n\u0103ng hi\u1ec7n c\u00f3 tr\u00ean c\u00e1c \u1ed1ng k\u00ednh hi\u1ec7n \u0111\u1ea1i ngo\u1ea1i tr\u1eeb t\u00ednh n\u0103ng \u1ed5n \u0111\u1ecbnh h\u00ecnh \u1ea3nh d\u1ef1a tr\u00ean \u1ed1ng k\u00ednh.<\/p>\n\n\n

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\"Sigma<\/figure>\n<\/div>\n\n\n

B\u1eaft \u0111\u1ea7u v\u1edbi v\u00f2ng kh\u1ea9u \u0111\u1ed9 (m\u1ed9t th\u1ee9 t\u01b0\u01a1ng \u0111\u1ed1i m\u1edbi \u0111\u1ed1i v\u1edbi \u1ed1ng k\u00ednh zoom, ch\u1ea5m h\u1ebft). V\u00f2ng kh\u1ea9u \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng tuy\u1ec7t v\u1eddi, cho b\u1ea1n kh\u1ea3 n\u0103ng ki\u1ec3m so\u00e1t ch\u00ednh x\u00e1c \u1edf m\u1ee9c d\u1eebng 1\/3 khi \u1edf ch\u1ebf \u0111\u1ed9 nh\u1ea5p v\u00e0 l\u01b0\u1edbt nh\u1eb9 nh\u00e0ng qua to\u00e0n b\u1ed9 ph\u1ea1m vi kh\u1ea9u \u0111\u1ed9 khi nh\u1ea3 n\u00fat.<\/p>\n\n\n

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\"Sigma<\/figure>\n<\/div>\n\n\n

\u1ede ph\u00eda d\u01b0\u1edbi b\u00ean tr\u00e1i c\u1ee7a \u1ed1ng k\u00ednh c\u00f3 c\u00f4ng t\u1eafc Click\/Declick cho ph\u00e9p b\u1ea1n l\u1ef1a ch\u1ecdn gi\u1eefa hai t\u00f9y ch\u1ecdn \u0111\u00f3.<\/p>\n\n\n

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\"Sigma<\/figure>\n<\/div>\n\n\n

Ph\u00eda b\u00ean ph\u1ea3i c\u1ee7a \u1ed1ng k\u00ednh l\u00e0 kh\u00f3a iris. Kh\u00f3a iris s\u1ebd cho ph\u00e9p b\u1ea1n kh\u00f3a v\u00e0o ho\u1eb7c ra kh\u1ecfi v\u00f2ng kh\u1ea9u \u0111\u1ed9. \u0110\u1ed1i v\u1edbi nh\u1eefng ng\u01b0\u1eddi mu\u1ed1n s\u1eed d\u1ee5ng v\u00f2ng kh\u1ea9u \u0111\u1ed9 v\u00e0 kh\u00f4ng v\u00f4 t\u00ecnh chuy\u1ec3n sang \u0111i\u1ec1u khi\u1ec3n kh\u1ea9u \u0111\u1ed9 d\u1ef1a tr\u00ean m\u00e1y \u1ea3nh, kh\u00f3a c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t khi b\u1ea1n \u0111ang \u1edf trong v\u00f2ng kh\u1ea9u \u0111\u1ed9 v\u00e0 gi\u1eef b\u1ea1n \u1edf \u0111\u00f3. N\u1ebfu b\u1ea1n kh\u00f4ng ph\u1ea3i l\u00e0 ng\u01b0\u1eddi d\u00f9ng v\u00f2ng kh\u1ea9u \u0111\u1ed9, b\u1ea1n c\u00f3 th\u1ec3 chuy\u1ec3n \u1ed1ng k\u00ednh sang v\u1ecb tr\u00ed A v\u00e0 \u0111i\u1ec1u khi\u1ec3n n\u00f3 t\u1eeb b\u00ean trong m\u00e1y \u1ea3nh. K\u00edch ho\u1ea1t kh\u00f3a iris khi \u1edf ch\u1ebf \u0111\u1ed9 A \u0111\u1ea3m b\u1ea3o r\u1eb1ng b\u1ea1n s\u1ebd kh\u00f4ng v\u00f4 t\u00ecnh va v\u00e0o \u0111i\u1ec1u khi\u1ec3n kh\u1ea9u \u0111\u1ed9 th\u1ee7 c\u00f4ng.<\/p>\n\n\n

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\"\"<\/figure>\n<\/div>\n\n\n

Ph\u00eda b\u00ean tr\u00e1i c\u1ee7a \u1ed1ng k\u00ednh c\u0169ng c\u00f3 c\u00f4ng t\u1eafc AF\/MF (lu\u00f4n \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 cao!) c\u00f9ng v\u1edbi m\u1ed9t trong hai n\u00fat t\u00f9y ch\u1ec9nh\/ch\u1ee9c n\u0103ng.<\/a><\/p>\n\n\n

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\"Sigma<\/figure>\n<\/div>\n\n\n

C\u00f3 m\u1ed9t n\u00fat ch\u1ee9c n\u0103ng th\u1ee9 hai \u1edf ph\u00eda tr\u00ean \u1ed1ng k\u00ednh \u0111\u1ec3 s\u1eed d\u1ee5ng khi ch\u1ee5p \u1edf v\u1ecb tr\u00ed th\u1eb3ng \u0111\u1ee9ng.<\/p>\n\n\n

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\"\"<\/figure>\n<\/div>\n\n\n

Ch\u1ee9c n\u0103ng c\u1ee7a c\u00e1c n\u00fat n\u00e0y (l\u00e0 n\u00fat d\u1ef1 ph\u00f2ng, kh\u00f4ng ph\u1ea3i l\u00e0 hai ch\u1ee9c n\u0103ng ri\u00eang bi\u1ec7t) c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c c\u00e0i \u0111\u1eb7t t\u1eeb b\u00ean trong m\u00e1y \u1ea3nh.<\/p>\n\n\n\n

Ph\u00eda d\u01b0\u1edbi \u1ed1ng k\u00ednh l\u00e0 m\u1ed9t kh\u00f3a \u0111\u1ec3 ng\u0103n ch\u1eb7n hi\u1ec7n t\u01b0\u1ee3ng zoom b\u1ecb tr\u01b0\u1ee3t. \u0110\u00e2y l\u00e0 \u1ed1ng k\u00ednh zoom b\u00ean ngo\u00e0i, m\u1eb7c d\u00f9 \u0111\u1ed9 ch\u00ednh x\u00e1c trong c\u01a1 ch\u1ebf zoom v\u00e0 \u1ed1ng k\u00ednh m\u1edf r\u1ed9ng c\u00f3 ngh\u0129a l\u00e0 kh\u1ea3 n\u0103ng zoom b\u1ecb tr\u01b0\u1ee3t r\u1ea5t th\u1ea5p tr\u1eeb khi b\u1ea1n c\u00f3 th\u1ee9 g\u00ec \u0111\u00f3 c\u1ecd x\u00e1t c\u1ee5 th\u1ec3 v\u00e0o v\u00f2ng zoom (v\u00ed d\u1ee5 nh\u01b0 khi \u0111i b\u1ed9 \u0111\u01b0\u1eddng d\u00e0i). Kh\u00f3a s\u1ebd ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng \u1edf ch\u1ebf \u0111\u1ed9 r\u1ed9ng (28mm).<\/p>\n\n\n

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\"Sigma<\/figure>\n<\/div>\n\n\n

N\u00f2ng s\u00fang b\u00ean trong m\u1edf r\u1ed9ng kho\u1ea3ng 43mm khi thu nh\u1ecf \u0111\u1ebfn v\u1ecb tr\u00ed 105mm v\u00e0 t\u00f4i l\u01b0u \u00fd r\u1eb1ng n\u00f2ng s\u00fang b\u00ean trong \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf r\u1ea5t t\u1ed1t v\u00e0 m\u01b0\u1ee3t m\u00e0 \u2013 kh\u00f4ng b\u1ecb rung l\u1eafc.<\/p>\n\n\n\n

\u0110i\u1ec1u \u0111\u00e1ng ch\u00fa \u00fd l\u00e0 \u1ed1ng k\u00ednh Sigma c\u00f3 kh\u1ea3 n\u0103ng zoom ng\u01b0\u1ee3c v\u1edbi \u1ed1ng k\u00ednh Sony (v\u00e0 h\u1ea7u h\u1ebft m\u1ecdi th\u01b0\u01a1ng hi\u1ec7u kh\u00e1c tr\u00ean ng\u00e0m E). Th\u1ef1c ra th\u00ec \u0111i\u1ec1u n\u00e0y h\u01a1i kh\u00f3 ch\u1ecbu.<\/a><\/p>\n\n\n\n

V\u00f2ng zoom l\u00e0 v\u00f2ng g\u1ea7n h\u01a1n trong hai v\u00f2ng, v\u1edbi v\u00f2ng l\u1ea5y n\u00e9t th\u1ee7 c\u00f4ng xa h\u01a1n. V\u00f2ng l\u1ea5y n\u00e9t th\u1ee7 c\u00f4ng \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n t\u1ed1t, v\u1edbi g\u1edd r\u1ed9ng v\u00e0 gi\u1ea3m ch\u1ea5n t\u1ed1t. N\u00f3 t\u1ea1o ra s\u1ef1 m\u00f4 ph\u1ecfng ti\u00eau \u0111i\u1ec3m t\u1ed1t, m\u1eb7c d\u00f9 gi\u1ed1ng nh\u01b0 t\u1ea5t c\u1ea3 c\u00e1c \u1ed1ng k\u00ednh l\u1ea5y n\u00e9t t\u1ef1 \u0111\u1ed9ng kh\u00f4ng g\u01b0\u01a1ng l\u1eadt, \u0111\u00e2y l\u00e0 l\u1ea5y n\u00e9t b\u1eb1ng d\u00e2y. \u0110\u1ea7u v\u00e0o cho v\u00f2ng l\u1ea5y n\u00e9t \u0111\u01b0\u1ee3c \u0111\u1ecbnh tuy\u1ebfn th\u00f4ng qua \u0111\u1ed9ng c\u01a1 l\u1ea5y n\u00e9t v\u00e0 kh\u00f4ng c\u00f3 \u0111i\u1ec3m d\u1eebng c\u1ee9ng \u1edf ti\u00eau c\u1ef1 t\u1ed1i thi\u1ec3u ho\u1eb7c v\u00f4 c\u1ef1c.<\/p>\n\n\n

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Nh\u00ecn chung, \u1ed1ng k\u00ednh n\u00e0y mang phong c\u00e1ch hi\u1ec7n \u0111\u1ea1i c\u1ee7a Sigma, v\u1edbi nhi\u1ec1u \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u1ee9ng v\u00e0 m\u1ed9t v\u00e0i k\u1ebft c\u1ea5u kh\u00e1c nhau.<\/p>\n\n\n

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\u1ed0ng k\u00ednh n\u00e0y ch\u1ea3y v\u00e0o n\u1eafp \u1ed1ng k\u00ednh, c\u00f3 kh\u00f3a, ph\u1ea7n cao su \u0111\u1ec3 t\u1ea1o c\u1ea3m gi\u00e1c m\u1ec1m m\u1ea1i v\u00e0 ph\u1ea7n c\u00f3 g\u00e2n \u0111\u1ec3 b\u00e1m t\u1ed1t h\u01a1n khi l\u1eafp ho\u1eb7c th\u00e1o. N\u1eafp \u1ed1ng k\u00ednh c\u1ee7a Sigma \u0111\u1eb9p h\u01a1n h\u1ea7u h\u1ebft c\u00e1c th\u01b0\u01a1ng hi\u1ec7u kh\u00e1c. Ngo\u00e0i ra c\u00f2n c\u00f3 h\u1ed9p \u0111\u1ef1ng b\u1eb1ng nylon c\u00f3 \u0111\u1ec7m.<\/a><\/p>\n\n\n

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M\u1eb7c d\u00f9 t\u00f4i ch\u01b0a th\u1ea5y s\u01a1 \u0111\u1ed3 c\u1eaft c\u00e1c \u0111i\u1ec3m b\u1ecbt \u200b\u200bk\u00edn th\u1eddi ti\u1ebft, nh\u01b0ng t\u00f4i bi\u1ebft r\u1eb1ng Sigma qu\u1ea3ng c\u00e1o r\u1eb1ng \u1ed1ng k\u00ednh n\u00e0y c\u00f3 kh\u1ea3 n\u0103ng b\u1ecbt k\u00edn th\u1eddi ti\u1ebft chuy\u00ean nghi\u1ec7p. C\u00f3 m\u1ed9t mi\u1ebfng \u0111\u1ec7m \u1edf ng\u00e0m \u1ed1ng k\u00ednh, l\u1edbp ph\u1ee7 ch\u1ed1ng th\u1ea5m n\u01b0\u1edbc v\u00e0 d\u1ea7u tr\u00ean th\u00e0nh ph\u1ea7n ph\u00eda tr\u01b0\u1edbc v\u00e0 c\u00e1c mi\u1ebfng \u0111\u1ec7m b\u00ean trong tr\u00ean to\u00e0n b\u1ed9 \u1ed1ng k\u00ednh. Sigma g\u1ecdi \u0111\u00e2y l\u00e0 “c\u1ea5u tr\u00fac ch\u1ed1ng b\u1ee5i v\u00e0 n\u01b0\u1edbc b\u1eafn”.<\/p>\n\n\n

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K\u00edch th\u01b0\u1edbc c\u01a1 b\u1ea3n c\u1ee7a \u1ed1ng k\u00ednh (trong ng\u00e0m Sony E, nh\u01b0 \u0111\u00e3 th\u1eed nghi\u1ec7m) l\u00e0 \u0111\u01b0\u1eddng k\u00ednh 87,8mm (3,5\u2033) v\u00e0 chi\u1ec1u d\u00e0i 159,9 (6,3\u2033). N\u00f3 n\u1eb7ng 990g (34,9oz) v\u00e0 c\u00f3 ren l\u1ecdc ph\u00eda tr\u01b0\u1edbc 82mm. Theo nhi\u1ec1u c\u00e1ch, \u1ed1ng k\u00ednh n\u00e0y c\u00f3 k\u00edch th\u01b0\u1edbc v\u1eadt l\u00fd t\u01b0\u01a1ng t\u1ef1 nh\u01b0 \u1ed1ng k\u00ednh 28-45mm F1.8 g\u1ea7n \u0111\u00e2y, m\u1eb7c d\u00f9 \u1ed1ng k\u00ednh \u0111\u00f3 c\u00f3 thi\u1ebft k\u1ebf zoom b\u00ean trong.<\/p>\n\n\n

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\u0110\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n, \u1ed1ng k\u00ednh Tamron 35-150mm trong h\u00ecnh c\u00f3 k\u00edch th\u01b0\u1edbc 89,2 x 158 mm (k\u00edch th\u01b0\u1edbc r\u1ea5t gi\u1ed1ng nhau) nh\u01b0ng n\u1eb7ng h\u01a1n 175g.<\/a><\/p>\n\n\n

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Tuy nhi\u00ean, Canon 24-105mm F2.8L l\u00e0 m\u1ed9t qu\u00e1i v\u1eadt, v\u1edbi k\u00edch th\u01b0\u1edbc 88,5 x 199 mm v\u00e0 n\u1eb7ng h\u01a1n 310g. T\u00f3m l\u1ea1i l\u00e0 Sigma \u0111\u00e3 l\u00e0m t\u1ed1t trong vi\u1ec7c qu\u1ea3n l\u00fd k\u00edch th\u01b0\u1edbc v\u00e0 tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a \u1ed1ng k\u00ednh, m\u1eb7c d\u00f9, c\u00f4ng b\u1eb1ng m\u00e0 n\u00f3i, n\u00f3 kh\u00f4ng c\u00f3 ph\u1ea1m vi zoom l\u1edbn nh\u01b0 Canon hay Tamron, v\u00e0 Canon c\u0169ng c\u00f3 ch\u1ee9c n\u0103ng \u1ed5n \u0111\u1ecbnh h\u00ecnh \u1ea3nh trong khi Tamron c\u00f3 kh\u1ea9u \u0111\u1ed9 t\u1ed1i \u0111a l\u1edbn h\u01a1n (F2-2.8) tr\u00ean to\u00e0n b\u1ed9 ph\u1ea1m vi zoom c\u1ee7a n\u00f3.<\/p>\n\n\n\n

M\u1ed1ng m\u1eaft kh\u1ea9u \u0111\u1ed9 l\u00e0 \u0111i\u1ec3m \u0111\u1ed9c \u0111\u00e1o c\u1ee7a \u1ed1ng k\u00ednh Sigma v\u00ec n\u00f3 c\u00f3 12 l\u00e1 kh\u1ea9u, gi\u00fap gi\u1eef cho m\u1ed1ng m\u1eaft kh\u1ea9u \u0111\u1ed9 c\u00f3 h\u00ecnh tr\u00f2n ngay c\u1ea3 khi \u1ed1ng k\u00ednh thu h\u1eb9p l\u1ea1i.<\/p>\n\n\n

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\u0110i\u1ec1u n\u00e0y c\u0169ng t\u1ea1o ra hi\u1ec7u \u1ee9ng sunstar 12 l\u00e1 r\u00f5 n\u00e9t h\u01a1n, v\u00ec trong khi kh\u1ea9u \u0111\u1ed9 l\u00e1 l\u1ebb th\u1ef1c s\u1ef1 t\u1ea1o ra g\u1ea5p \u0111\u00f4i l\u01b0\u1ee3ng tia n\u1eafng (kh\u1ea9u \u0111\u1ed9 11 l\u00e1 c\u00f3 hi\u1ec7u \u1ee9ng sunstar v\u1edbi 22 \u0111i\u1ec3m, nh\u01b0ng kh\u1ea9u \u0111\u1ed9 12 l\u00e1 c\u00f3 12 \u0111i\u1ec3m. C\u00e1 nh\u00e2n t\u00f4i th\u00edch v\u1ebb ngo\u00e0i s\u1ea1ch s\u1ebd h\u01a1n c\u1ee7a nh\u1eefng tia sunburst n\u00e0y, m\u1eb7c d\u00f9 Sigma b\u00e1o c\u00e1o r\u1eb1ng \u0111\u00e2y ch\u1ec9 l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng x\u1ea3y ra m\u1ed9t l\u1ea7n v\u1edbi \u1ed1ng k\u00ednh n\u00e0y v\u00e0 h\u1ecd kh\u00f4ng c\u00f3 k\u1ebf ho\u1ea1ch chuy\u1ec3n sang kh\u1ea9u \u0111\u1ed9 c\u00f3 s\u1ed1 l\u01b0\u1ee3ng l\u00e1 \u0111\u1ec1u.\"Ezoic\"<\/p>\n\n\n

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Kho\u1ea3ng c\u00e1ch l\u1ea5y n\u00e9t t\u1ed1i thi\u1ec3u l\u00e0 40cm, cho ph\u00e9p ph\u00f3ng \u0111\u1ea1i 0,32x (1:3:1) r\u1ea5t h\u1eefu \u00edch \u1edf 105mm:<\/p>\n\n\n

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\u1ede m\u1ee9c 28mm, 40cm t\u1ea1o ra k\u1ebft qu\u1ea3 n\u00e0y:<\/p>\n\n\n

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Nh\u01b0ng sau \u0111\u00f3 b\u1ea1n c\u00f3 th\u1ec3 ph\u00f3ng to t\u1edbi 105mm v\u00e0 c\u00f3 \u0111\u01b0\u1ee3c m\u1ee9c \u0111\u1ed9 ph\u00f3ng \u0111\u1ea1i r\u1ea5t kh\u00e1c bi\u1ec7t.<\/p>\n\n\n

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K\u1ebft h\u1ee3p v\u1edbi kh\u1ea9u \u0111\u1ed9 F2.8 cho ph\u00e9p t\u1ea1o ra h\u1eadu c\u1ea3nh m\u1edd r\u1ea5t \u0111\u1eb9p v\u00e0 hi\u1ec7u su\u1ea5t ch\u1ee5p c\u1eadn c\u1ea3nh kh\u00e1 t\u1ed1t.<\/p>\n\n\n

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V\u00ec t\u00f4i \u0111\u00e1nh gi\u00e1 r\u1ea5t nhi\u1ec1u \u1ed1ng k\u00ednh Sigma, n\u00ean c\u00f3 r\u1ea5t nhi\u1ec1u th\u1ee9 quen thu\u1ed9c \u1edf \u0111\u00e2y, khi\u1ebfn ch\u00fang ta d\u1ec5 d\u00e0ng coi s\u1ef1 xu\u1ea5t s\u1eafc trong thi\u1ebft k\u1ebf c\u1ee7a ch\u00fang l\u00e0 \u0111i\u1ec1u hi\u1ec3n nhi\u00ean. Sigma \u0111ang t\u00edch h\u1ee3p nhi\u1ec1u t\u00ednh n\u0103ng v\u00e0o c\u00e1c \u1ed1ng k\u00ednh h\u00e0ng \u0111\u1ea7u c\u1ee7a h\u1ecd nh\u01b0 b\u1ea5t k\u1ef3 ai kh\u00e1c ngo\u00e0i kia, v\u00e0 \u0111i\u1ec1u \u0111\u00f3 th\u1eadt tuy\u1ec7t v\u1eddi trong m\u1ed9t \u1ed1ng k\u00ednh t\u1ed1t nh\u01b0 nhau cho c\u1ea3 video v\u00e0 \u1ea3nh t\u0129nh. \u0110\u00e2y l\u00e0 m\u1ed9t \u1ed1ng k\u00ednh l\u1edbn, nh\u01b0ng nh\u01b0 ch\u00fang ta \u0111\u00e3 th\u1ea5y, n\u00f3 th\u1ef1c s\u1ef1 nh\u1ecf h\u01a1n v\u00e0 nh\u1eb9 h\u01a1n m\u1ed9t ch\u00fat so v\u1edbi c\u00e1c \u0111\u1ed1i th\u1ee7 c\u1ea1nh tranh. V\u00e0, v\u1edbi m\u1ee9c gi\u00e1 1499 \u0111\u00f4 la M\u1ef9 (2099 \u0111\u00f4 la \u1edf \u0111\u00e2y t\u1ea1i Canada), n\u00f3 kh\u00f4ng ph\u1ea3i l\u00e0 qu\u00e1 \u0111\u1eaft (Tamron 35-150 VXD c\u00f3 gi\u00e1 cao h\u01a1n 300-400 \u0111\u00f4 la M\u1ef9).<\/p>\n\n\n\n

T\u1ef1 \u0111\u1ed9ng l\u1ea5y n\u00e9t v\u00e0 Video<\/h1>\n\n\n\n

\u0110\u00e2y l\u00e0 m\u1ed9t l\u0129nh v\u1ef1c kh\u00e1c m\u00e0 Sigma \u0111\u00e3 c\u00f3 m\u1ed9t s\u1ed1 b\u01b0\u1edbc ti\u1ebfn quan tr\u1ecdng. C\u00e1c s\u1ea3n ph\u1ea9m ban \u0111\u1ea7u c\u1ee7a h\u1ecd tr\u00ean Sony (v\u00e0 ng\u00e0m L) c\u00f3 \u0111\u1ed9ng c\u01a1 l\u1ea5y n\u00e9t STM, nh\u01b0ng Sigma k\u1ec3 t\u1eeb \u0111\u00f3 \u0111\u00e3 ph\u00e1t h\u00e0nh \u0111\u1ed9ng c\u01a1 l\u1ea5y n\u00e9t HLA (B\u1ed9 truy\u1ec1n \u0111\u1ed9ng tuy\u1ebfn t\u00ednh t\u1ed1c \u0111\u1ed9 cao) m\u1ea1nh m\u1ebd v\u00e0 m\u01b0\u1ee3t m\u00e0 h\u01a1n. \u0110\u1ed9ng c\u01a1 HLA c\u00f3 m\u00f4-men xo\u1eafn\/l\u1ef1c \u0111\u1ea9y l\u1edbn h\u01a1n nhi\u1ec1u so v\u1edbi c\u00e1c \u1ed1ng k\u00ednh \u0111\u01b0\u1ee3c trang b\u1ecb \u0111\u1ed9ng c\u01a1 b\u01b0\u1edbc, \u0111i\u1ec1u n\u00e0y r\u1ea5t quan tr\u1ecdng khi b\u1ea1n \u0111ang n\u00f3i v\u1ec1 m\u1ed9t \u1ed1ng k\u00ednh c\u00f3 th\u1ea5u k\u00ednh quang h\u1ecdc l\u1edbn h\u01a1n, n\u1eb7ng h\u01a1n nh\u01b0 \u1ed1ng k\u00ednh n\u00e0y. L\u1ef1c \u0111\u1ea9y t\u0103ng l\u00ean c\u1ee7a \u0111\u1ed9ng c\u01a1 l\u1ea5y n\u00e9t c\u00f3 ngh\u0129a l\u00e0 n\u00f3 c\u00f3 kh\u1ea3 n\u0103ng di chuy\u1ec3n nhanh h\u01a1n nhi\u1ec1u v\u00e0 do \u0111\u00f3 ph\u1ea3n \u1ee9ng nhanh h\u01a1n nhi\u1ec1u. C\u00e1c thay \u0111\u1ed5i ti\u00eau \u0111i\u1ec3m trong th\u1ebf gi\u1edbi th\u1ef1c v\u1ec1 c\u01a1 b\u1ea3n l\u00e0 t\u1ee9c th\u1eddi, khi\u1ebfn \u1ed1ng k\u00ednh n\u00e0y th\u1eadm ch\u00ed c\u00f3 th\u1ec3 theo k\u1ecbp m\u1ed9t s\u1ed1 h\u00e0nh \u0111\u1ed9ng. T\u00f4i \u0111\u00e3 s\u1eed d\u1ee5ng n\u00f3 th\u00e0nh c\u00f4ng t\u1ea1i m\u1ed9t cu\u1ed9c thi rodeo v\u00e0 m\u1eb7c d\u00f9 \u0111i\u1ec1u ki\u1ec7n \u00e1nh s\u00e1ng khi\u1ebfn t\u00f4i kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng c\u00f3 \u0111\u01b0\u1ee3c t\u1ed1c \u0111\u1ed9 m\u00e0n tr\u1eadp nhanh nh\u01b0 mong mu\u1ed1n, nh\u01b0ng t\u00f4i v\u1eabn c\u00f3 th\u1ec3 theo d\u00f5i v\u00e0 ch\u1ee5p th\u00e0nh c\u00f4ng h\u00e0nh \u0111\u1ed9ng \u0111\u00f3.<\/p>\n\n\n

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\u0110i\u1ec1u n\u00e0y c\u00e0ng l\u00e0m t\u0103ng th\u00eam t\u00ednh x\u00e1c th\u1ef1c c\u1ee7a \u1ed1ng k\u00ednh 28-105 DN nh\u01b0 m\u1ed9t l\u1ef1a ch\u1ecdn tuy\u1ec7t v\u1eddi cho c\u00e1c s\u1ef1 ki\u1ec7n ho\u1eb7c \u0111\u00e1m c\u01b0\u1edbi, v\u00ec ngay c\u1ea3 khi c\u00f3 chuy\u1ec3n \u0111\u1ed9ng, ch\u1ee9c n\u0103ng l\u1ea5y n\u00e9t t\u1ef1 \u0111\u1ed9ng v\u1eabn c\u00f3 th\u1ec3 theo k\u1ecbp.<\/a><\/p>\n\n\n

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\u00c2m thanh l\u1ea5y n\u00e9t v\u1ec1 c\u01a1 b\u1ea3n l\u00e0 kh\u00f4ng t\u1ed3n t\u1ea1i. \u0110\u1ed9ng c\u01a1 HLA v\u1ec1 c\u01a1 b\u1ea3n l\u00e0 im l\u1eb7ng ngay c\u1ea3 khi t\u00f4i \u0111\u1eb7t tai c\u1ea1nh \u1ed1ng k\u00ednh. N\u00f3 \u0111\u1ee7 im l\u1eb7ng \u0111\u1ec3 t\u00f4i th\u1ef1c s\u1ef1 nh\u00ecn l\u00ean m\u00e0n h\u00ecnh \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u1ed1ng k\u00ednh th\u1ef1c s\u1ef1 \u0111ang l\u1ea5y n\u00e9t.<\/p>\n\n\n\n

\u0110\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a ti\u00eau \u0111i\u1ec3m c\u0169ng t\u1ed1t. T\u00f4i kh\u00f4ng th\u1ef1c s\u1ef1 nh\u1edb b\u1ea5t k\u1ef3 b\u1ee9c \u1ea3nh n\u00e0o trong b\u00e0i \u0111\u00e1nh gi\u00e1 c\u1ee7a m\u00ecnh b\u1ecb b\u1ecf l\u1ee1 do ti\u00eau \u0111i\u1ec3m k\u00e9m trong b\u1ea5t k\u1ef3 t\u00ecnh hu\u1ed1ng h\u1ee3p l\u00fd n\u00e0o (t\u00f4i \u0111\u00e3 c\u00f3 m\u1ed9t v\u00e0i l\u1ea7n trong cu\u1ed9c \u0111ua rodeo m\u00e0 ti\u00eau \u0111i\u1ec3m b\u00e1m v\u00e0o thanh ray ph\u00eda tr\u01b0\u1edbc t\u00f4i thay v\u00ec ch\u1ee7 th\u1ec3 ph\u00eda sau, nh\u01b0ng \u0111i\u1ec1u \u0111\u00f3 c\u00f3 th\u1ec3 hi\u1ec3u \u0111\u01b0\u1ee3c).<\/p>\n\n\n

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T\u00ednh n\u0103ng Eye AF r\u1ea5t tuy\u1ec7t v\u1eddi, mang l\u1ea1i k\u1ebft qu\u1ea3 r\u1ea5t ch\u00ednh x\u00e1c d\u00f9 ch\u1ee5p \u1ea3nh \u0111\u1ed9ng v\u1eadt\u2026<\/p>\n\n\n

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\u2026ho\u1eb7c m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 con ng\u01b0\u1eddi.<\/p>\n\n\n

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T\u00f4i c\u0169ng th\u1ea5y h\u1ea7u h\u1ebft k\u1ebft qu\u1ea3 t\u1ed1t cho c\u00f4ng vi\u1ec7c quay video. L\u1ea5y n\u00e9t t\u1ef1 \u0111\u1ed9ng r\u1ea5t nhanh v\u00e0 t\u1ef1 tin. Kh\u00f4ng c\u00f3 hi\u1ec7n t\u01b0\u1ee3ng s\u0103n \u0111u\u1ed5i hay d\u1eebng l\u1ea1i. L\u1ea5y n\u00e9t \u0111\u1ee7 nhanh \u0111\u1ec3 b\u1ea1n c\u00f3 th\u1ec3 mu\u1ed1n l\u00e0m ch\u1eadm n\u00f3 trong m\u00e1y \u1ea3nh n\u1ebfu b\u1ea1n mu\u1ed1n chuy\u1ec3n \u0111\u1ed5i l\u1ea5y n\u00e9t \u0111i\u1ec7n \u1ea3nh h\u01a1n. C\u00f3 m\u1ed9t s\u1ed1 hi\u1ec7n t\u01b0\u1ee3ng th\u1edf l\u1ea5y n\u00e9t, m\u1eb7c d\u00f9 kh\u00f4ng qu\u00e1 m\u1ee9c.<\/a><\/p>\n\n\n\n

B\u00e0i ki\u1ec3m tra b\u1eb1ng tay c\u1ee7a t\u00f4i, trong \u0111\u00f3 t\u00f4i l\u1ea7n l\u01b0\u1ee3t d\u00f9ng tay ch\u1eb7n g\u00f3c nh\u00ecn khu\u00f4n m\u1eb7t c\u1ee7a m\u00e1y \u1ea3nh r\u1ed3i b\u1ecf ra, di\u1ec5n ra kh\u00e1 t\u1ed1t, v\u1edbi nh\u1eefng \u0111i\u1ec1u ch\u1ec9nh ch\u00ednh x\u00e1c t\u1eeb khu\u00f4n m\u1eb7t \u0111\u1ebfn v\u1ecb tr\u00ed c\u1ea7n ch\u1ee5p.<\/p>\n\n\n\n

T\u00f4i c\u0169ng th\u1ea5y r\u1eb1ng trong c\u00e1c c\u1ea3nh quay th\u1ef1c t\u1ebf, vi\u1ec7c thay \u0111\u1ed5i ti\u00eau \u0111i\u1ec3m c\u00f3 xu h\u01b0\u1edbng \u0111\u1ed9t ng\u1ed9t h\u01a1n so v\u1edbi nh\u1eefng g\u00ec t\u00f4i mong mu\u1ed1n. C\u00f3 r\u1ea5t nhi\u1ec1u l\u1ef1c \u0111\u1ea9y trong \u0111\u1ed9ng c\u01a1 l\u1ea5y n\u00e9t n\u00e0y, nh\u01b0ng c\u00f3 l\u1ebd s\u1ebd t\u1ed1t h\u01a1n n\u1ebfu \u0111i\u1ec1u ch\u1ec9nh n\u00f3 xu\u1ed1ng m\u1ed9t ch\u00fat \u1edf ch\u1ebf \u0111\u1ed9 video\u2026 \u0111\u1eb7c bi\u1ec7t l\u00e0 trong m\u1ed9t \u1ed1ng k\u00ednh c\u00f3 th\u1ec3 s\u1ebd r\u1ea5t \u0111\u01b0\u1ee3c mong mu\u1ed1n cho c\u00f4ng vi\u1ec7c quay video.<\/p>\n\n\n\n

V\u1ec1 m\u1eb7t t\u00edch c\u1ef1c, t\u00f4i \u0111\u00e3 s\u1eed d\u1ee5ng \u1ed1ng k\u00ednh 28-105 DN cho kho\u1ea3ng n\u1eeda t\u00e1 c\u00e1c t\u1eadp video tr\u00ean YouTube c\u1ee7a m\u00ecnh v\u00e0 kh\u1ea3 n\u0103ng t\u1eadp trung r\u1ea5t t\u1ed1t trong c\u00e1c t\u1eadp \u0111\u00f3.<\/a><\/p>\n\n\n

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\u0110\u1ed9ng c\u01a1 l\u1ea5y n\u00e9t HLA c\u1ee7a Sigma r\u1ea5t tuy\u1ec7t, m\u1eb7c d\u00f9 ch\u00fang c\u00f3 m\u1ed9t ch\u00fat h\u1ea1n ch\u1ebf \u1edf Sony v\u00ec Sony gi\u1edbi h\u1ea1n ch\u1ebf \u0111\u1ed9 ch\u1ee5p li\u00ean ti\u1ebfp \u1edf m\u1ee9c 15FPS v\u1edbi \u1ed1ng k\u00ednh c\u1ee7a b\u00ean th\u1ee9 ba, do \u0111\u00f3, \u0111\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng \u0111i\u1ec3m m\u00e0 \u1ed1ng k\u00ednh 28-105 DN s\u1ebd kh\u00f4ng hi\u1ec7u qu\u1ea3 b\u1eb1ng \u1ed1ng k\u00ednh zoom G Master trong m\u1ed9t s\u1ed1 \u1ee9ng d\u1ee5ng nh\u1ea5t \u0111\u1ecbnh.<\/p>\n\n\n\n

Ph\u00e2n t\u00edch ch\u1ea5t l\u01b0\u1ee3ng h\u00ecnh \u1ea3nh<\/h1>\n\n\n\n

Nh\u01b0 t\u00f4i \u0111\u00e3 l\u01b0u \u00fd trong ph\u1ea7n gi\u1edbi thi\u1ec7u, \u0111\u00e2y l\u00e0 m\u1ed9t \u1ed1ng k\u00ednh kh\u00e1 \u0111\u1eb7c bi\u1ec7t v\u1ec1 m\u1eb7t quang h\u1ecdc. C\u00f4ng th\u1ee9c quang h\u1ecdc kh\u00e1 ph\u1ee9c t\u1ea1p (18 th\u1ea5u k\u00ednh trong 13 nh\u00f3m) v\u00e0 bao g\u1ed3m 2 th\u1ea5u k\u00ednh FLD, 2 th\u1ea5u k\u00ednh SLD v\u00e0 5 th\u1ea5u k\u00ednh phi c\u1ea7u. Khi xem bi\u1ec3u \u0111\u1ed3 MTF c\u1ee7a nhi\u1ec1u \u1ed1ng k\u00ednh kh\u00e1c nhau, ta th\u1ea5y r\u1eb1ng 28-105 DN c\u00f3 ch\u1ea5t l\u01b0\u1ee3ng t\u1ed1t khi so s\u00e1nh v\u1edbi 24-70mm F2.8 DN ART ho\u1eb7c \u1ed1ng k\u00ednh 24-105mm F4 DG HSM th\u1eddi DSLR c\u0169 h\u01a1n<\/p>\n\n\n\n

\u1ede m\u1ee9c t\u1ed1t nh\u1ea5t, 28-105 DN c\u00f3 th\u1ec3 t\u1ea1o ra nh\u1eefng h\u00ecnh \u1ea3nh c\u00f3 nhi\u1ec1u chi ti\u1ebft, \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n v\u00e0 n\u1ed5i b\u1eadt.<\/p>\n\n\n

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Tuy nhi\u00ean, \u0111i\u1ec1u \u0111\u00f3 kh\u00f4ng c\u00f3 ngh\u0129a l\u00e0 \u1ed1ng k\u00ednh n\u00e0y ho\u00e0n h\u1ea3o, v\u00ec n\u00f3 v\u1eabn b\u1ed9c l\u1ed9 m\u1ed9t v\u00e0i \u0111i\u1ec3m y\u1ebfu v\u1ec1 quang h\u1ecdc. \u0110\u00e2y l\u00e0 m\u1ed9t c\u00f4ng vi\u1ec7c r\u1ea5t ph\u1ee9c t\u1ea1p v\u00e0 r\u00f5 r\u00e0ng l\u00e0 nh\u1eefng th\u1ecfa hi\u1ec7p \u0111\u00e3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n. Ch\u00fang t\u00f4i kh\u00f4ng ch\u1ec9 duy tr\u00ec kh\u1ea9u \u0111\u1ed9 F2.8 kh\u00f4ng \u0111\u1ed5i (cho to\u00e0n khung h\u00ecnh) trong \u1ed1ng k\u00ednh zoom n\u00e0y m\u00e0 c\u00f2n chuy\u1ec3n t\u1eeb g\u00f3c r\u1ed9ng v\u1eeba ph\u1ea3i \u1edf 28mm sang tele v\u1eeba ph\u1ea3i \u1edf 105mm. Sau \u0111\u00e2y l\u00e0 h\u00ecnh \u1ea3nh c\u00f9ng m\u1ed9t c\u1ea3nh \u1edf t\u1ea5t c\u1ea3 n\u0103m v\u1ecb tr\u00ed \u0111\u01b0\u1ee3c \u0111\u00e1nh d\u1ea5u tr\u00ean \u1ed1ng k\u00ednh (28, 35, 50, 70 v\u00e0 105mm):<\/a><\/p>\n\n\n\n

\u0110\u1ea7u ti\u00ean, m\u1ed9t s\u1ed1 \u0111i\u1ec1u t\u1ed1t. Kh\u00f4ng c\u00f3 nhi\u1ec1u b\u1eb1ng ch\u1ee9ng v\u1ec1 quang sai m\u00e0u d\u1ecdc (LoCA) \u1edf \u0111\u00e2y, v\u1edbi k\u1ebft qu\u1ea3 r\u00f5 r\u00e0ng tr\u01b0\u1edbc v\u00e0 sau m\u1eb7t ph\u1eb3ng ti\u00eau \u0111i\u1ec3m. V\u1ec1 c\u01a1 b\u1ea3n kh\u00f4ng c\u00f3 b\u1eb1ng ch\u1ee9ng v\u1ec1 vi\u1ec1n \u1edf b\u1ea5t k\u1ef3 \u0111\u00e2u.<\/p>\n\n\n

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T\u00f4i ch\u1ee5p \u1ea3nh \u00e1nh s\u00e1ng m\u1eb7t tr\u1eddi nh\u1ea3y m\u00faa qua s\u01b0\u01a1ng s\u1edbm v\u00e0 t\u00f4i th\u1ea5y t\u1ea5t c\u1ea3 nh\u1eefng \u0111i\u1ec3m s\u00e1ng l\u1ea5p l\u00e1nh \u0111\u00f3 \u0111\u1ec1u kh\u00f4ng c\u00f3 vi\u1ec1n.<\/p>\n\n\n

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T\u00f4i c\u0169ng kh\u00f4ng th\u1ea5y v\u1ea5n \u0111\u1ec1 g\u00ec v\u1edbi LaCA (quang sai m\u00e0u b\u00ean), hi\u1ec7n ra d\u1ecdc theo c\u00e1c c\u1ea1nh c\u1ee7a khung h\u00ecnh. T\u1ea5t c\u1ea3 c\u00e1c chuy\u1ec3n \u0111\u1ed5i \u1edf \u0111\u00e2y \u0111\u1ec1u r\u1ea5t trung t\u00ednh.<\/a><\/p>\n\n\n

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Trong khi nhi\u1ec1u ng\u01b0\u1eddi ch\u1eafc ch\u1eafn s\u1ebd mong mu\u1ed1n \u1ed1ng k\u00ednh n\u00e0y c\u00f3 \u0111\u1ed9 r\u1ed9ng t\u1edbi 24mm, do \u0111\u00f3 cho ph\u00e9p c\u00e1c nhi\u1ebfp \u1ea3nh gia s\u1eed d\u1ee5ng n\u00f3 m\u1ed9t c\u00e1ch th\u1ef1c t\u1ebf h\u01a1n cho c\u00e1c b\u1ee9c \u1ea3nh g\u00f3c r\u1ed9ng. V\u1ea5n \u0111\u1ec1 khi s\u1eed d\u1ee5ng 24mm (nh\u01b0 Sigma \u0111\u00e3 x\u1eed l\u00fd tr\u00ean c\u00e1c \u1ed1ng k\u00ednh 24-70mm c\u1ee7a h\u1ecd) l\u00e0 r\u1ea5t kh\u00f3 \u0111\u1ec3 ki\u1ec3m so\u00e1t \u0111\u1ed9 m\u00e9o, v\u00e0 c\u00e1c \u1ed1ng k\u00ednh \u0111\u00f3 \u0111\u00e3 x\u1eed l\u00fd \u0111\u1ed9 m\u00e9o th\u00f9ng kh\u00e1 n\u1eb7ng \u1edf 24mm. L\u1ef1a ch\u1ecdn ch\u1ec9 s\u1eed d\u1ee5ng \u0111\u1ed9 r\u1ed9ng t\u1edbi 28mm (v\u1ec1 m\u1eb7t l\u00fd thuy\u1ebft) s\u1ebd cho ph\u00e9p thi\u1ebft k\u1ebf quang h\u1ecdc d\u1ec5 d\u00e0ng h\u01a1n. Th\u1eadt kh\u00f4ng may, t\u1ef7 l\u1ec7 zoom l\u1edbn c\u1ee7a \u1ed1ng k\u00ednh n\u00e0y \u0111\u00e3 d\u1eabn \u0111\u1ebfn c\u1ea3 \u0111\u1ed9 m\u00e9o l\u1edbn v\u00e0 ki\u1ec3u m\u00e9o h\u01a1i ph\u1ee9c t\u1ea1p.<\/p>\n\n\n

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T\u00f4i c\u1ea7n m\u1ed9t +26 r\u1ea5t \u0111\u00e1ng k\u1ec3 \u0111\u1ec3 hi\u1ec7u ch\u1ec9nh \u0111\u1ed9 m\u00e9o th\u1ee7 c\u00f4ng, m\u1eb7c d\u00f9 nh\u01b0 b\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y, hi\u1ec7u ch\u1ec9nh kh\u00f4ng ph\u1ea3i l\u00e0 tuy\u1ebfn t\u00ednh. L\u00e0m th\u1eb3ng c\u00e1c \u0111\u01b0\u1eddng g\u1ea7n t\u00e2m s\u1ebd khi\u1ebfn c\u00e1c c\u1ea1nh b\u1ecb k\u00e9o th\u00e0nh d\u1ea1ng m\u00e9o h\u00ecnh kim. Hi\u1ec7u \u1ee9ng h\u1ecda ti\u1ebft c\u0169ng r\u1ea5t n\u1eb7ng, c\u1ea7n +90 \u0111\u1ec3 hi\u1ec7u ch\u1ec9nh, ch\u1ec9 thi\u1ebfu m\u1ed9t ch\u00fat n\u1eefa l\u00e0 \u0111\u1ea1t \u0111\u1ebfn m\u1ee9c t\u1ed1i \u0111a c\u1ee7a thanh tr\u01b0\u1ee3t hi\u1ec7u ch\u1ec9nh trong Lightroom.<\/p>\n\n\n\n

Sigma \u0111\u00e3 cung c\u1ea5p cho t\u00f4i m\u1ed9t h\u1ed3 s\u01a1 hi\u1ec7u ch\u1ec9nh, v\u00e0 b\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng v\u1ec1 c\u01a1 b\u1ea3n n\u00f3 chia nh\u1ecf s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 \u0111\u1ed9 m\u00e9o, \u0111\u1ec3 l\u1ea1i m\u1ed9t ch\u00fat \u0111\u1ed9 m\u00e9o th\u00f9ng \u0111\u1ec3 tr\u00e1nh t\u1ea1o ra \u0111\u1ed9 m\u00e9o h\u00ecnh \u0111\u1ec7m kim. N\u00f3 l\u00e0m s\u1ea1ch hi\u1ec7u \u1ee9ng m\u1edd vi\u1ec1n r\u1ea5t t\u1ed1t.<\/a><\/p>\n\n\n

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Th\u1eadt kh\u00f4ng may l\u00e0 v\u1eabn c\u00f2n m\u1ed9t l\u01b0\u1ee3ng m\u00e9o kh\u00e1 \u0111\u00e1ng k\u1ec3 (b\u00e2y gi\u1edd l\u00e0 ki\u1ec3u kim kh\u00e2u) \u1edf \u0111\u1ea7u tele. \u0110\u1ed9 m\u1edd n\u00e9t \u00edt h\u01a1n kho\u1ea3ng m\u1ed9t stop (+61 \u0111\u1ec3 hi\u1ec7u ch\u1ec9nh) v\u00e0 t\u00f4i c\u1ea7n -10 \u0111\u1ec3 hi\u1ec7u ch\u1ec9nh \u0111\u1ed9 m\u00e9o.<\/p>\n\n\n

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\u0110\u1ed9 m\u00e9o \u0111\u00f3 \u0111\u1ee7 \u0111\u1ec3 t\u00f4i nh\u1eadn th\u1ea5y trong m\u1ed9t s\u1ed1 b\u1ee9c \u1ea3nh ch\u1ee5p ngo\u00e0i \u0111\u1eddi th\u1ef1c c\u1ee7a m\u00ecnh. N\u1ebfu b\u1ea1n nh\u00ecn v\u00e0o c\u00e1c \u0111\u01b0\u1eddng d\u1ecdc theo ph\u00eda b\u00ean tr\u00e1i c\u1ee7a h\u00ecnh \u1ea3nh n\u00e0y, b\u1ea1n s\u1ebd th\u1ea5y \u0111\u01b0\u1eddng cong do \u0111\u1ed9 m\u00e9o. T\u00f4i \u0111\u00e3 th\u1ea5y \u0111i\u1ec1u n\u00e0y trong m\u1ed9t s\u1ed1 b\u1ee9c \u1ea3nh.<\/p>\n\n\n

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M\u1ed9t l\u1ea7n n\u1eefa, c\u1ea5u h\u00ecnh hi\u1ec7u ch\u1ec9nh s\u1ebd gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 n\u00e0y, nh\u01b0ng n\u00f3 cho th\u1ea5y khu v\u1ef1c ph\u1ea3i \u0111\u00e1nh \u0111\u1ed5i v\u1ec1 m\u1eb7t k\u1ef9 thu\u1eadt \u0111\u1ec3 t\u1ea1o ra \u1ed1ng k\u00ednh n\u00e0y.<\/a><\/p>\n\n\n\n

V\u1eady c\u00f2n \u0111\u1ed9 ph\u00e2n gi\u1ea3i v\u00e0 \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n th\u00ec sao? C\u00e1c th\u1eed nghi\u1ec7m ch\u00ednh th\u1ee9c c\u1ee7a t\u00f4i \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n tr\u00ean Sony a7RV 61MP.<\/p>\n\n\n\n

MTF cho th\u1ea5y \u0111\u00e2y l\u00e0 m\u1ed9t \u1ed1ng k\u00ednh r\u1ea5t s\u1eafc n\u00e9t \u1edf v\u00f9ng trung t\u00e2m v\u00e0 gi\u1eefa khung h\u00ecnh, v\u1edbi hi\u1ec7n t\u01b0\u1ee3ng g\u00f3c b\u1ecb gi\u1ea3m \u0111i\u1ec3n h\u00ecnh \u1edf kh\u1ea9u \u0111\u1ed9 r\u1ed9ng. \u0110\u00f3 c\u00f3 ph\u1ea3i l\u00e0 nh\u1eefng g\u00ec ch\u00fang ta th\u1ea5y kh\u00f4ng? Sau \u0111\u00e2y l\u00e0 h\u00ecnh \u1ea3nh bi\u1ec3u \u0111\u1ed3 th\u1eed nghi\u1ec7m m\u00e0 \u1ea3nh c\u1eaft ra.<\/p>\n\n\n

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MTF cho th\u1ea5y s\u1ef1 ph\u1ea3n \u00e1nh ch\u00ednh x\u00e1c v\u1ec1 hi\u1ec7u su\u1ea5t th\u1ef1c t\u1ebf, v\u00ec t\u00f4i th\u1ea5y r\u1eb1ng, nh\u01b0 \u0111\u00e3 \u0111\u1ec1 xu\u1ea5t, ph\u1ea7n trung t\u00e2m tr\u00f4ng tuy\u1ec7t v\u1eddi, ph\u1ea7n gi\u1eefa khung h\u00ecnh r\u1ea5t t\u1ed1t, nh\u01b0ng c\u00e1c g\u00f3c cho th\u1ea5y \u0111\u1ed9 s\u1eafc n\u00e9t v\u00e0 \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n gi\u1ea3m \u0111\u00e1ng k\u1ec3. Sau \u0111\u00e2y l\u00e0 \u1ea3nh c\u1eaft t\u1eeb to\u00e0n b\u1ed9 khung h\u00ecnh \u1edf F2.8 v\u00e0 \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb \u1edf \u0111\u1ed9 ph\u00f3ng \u0111\u1ea1i 200%.<\/p>\n\n\n\n

Trong h\u1ea7u h\u1ebft c\u00e1c t\u00ecnh hu\u1ed1ng, \u0111i\u1ec1u n\u00e0y c\u00f3 l\u1ebd s\u1ebd kh\u00f4ng th\u00e0nh v\u1ea5n \u0111\u1ec1. Ch\u1ee5p v\u00e0o ban \u0111\u00eam ho\u1eb7c trong m\u1ed9t \u0111\u1ecba \u0111i\u1ec3m thi\u1ebfu s\u00e1ng, \u0111i\u1ec1u n\u00e0y hi\u1ebfm khi \u1ea3nh h\u01b0\u1edfng qu\u00e1 nhi\u1ec1u \u0111\u1ebfn m\u1ecdi th\u1ee9. T\u00f4i th\u1ea5y r\u1eb1ng c\u00e1c g\u00f3c ngo\u00e0i \u0111\u1eddi th\u1ef1c tr\u00f4ng kh\u00f4ng t\u1ec7 (\u1ea3nh n\u00e0y l\u00e0 1\/6 gi\u00e2y, F2.8, ISO 3200).\"Ezoic\"<\/p>\n\n\n

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B\u1ee9c \u1ea3nh ch\u1ee5p ph\u00e1o hoa n\u00e0y \u1edf F2.8, 28mm tr\u00f4ng \u0111\u1eb9p v\u00e0 s\u1eafc n\u00e9t.<\/p>\n\n\n

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C\u00e1c g\u00f3c t\u1ed1t h\u01a1n m\u1ed9t ch\u00fat \u1edf F4 v\u00e0 kh\u00e1 t\u1ed1t \u1edf F5.6, m\u1eb7c d\u00f9 ch\u00fang kh\u00f4ng bao gi\u1edd c\u00f3 th\u1ec3 s\u00e1nh b\u1eb1ng hi\u1ec7u su\u1ea5t \u1edf nh\u1eefng n\u01a1i kh\u00e1c trong khung h\u00ecnh.<\/p>\n\n\n

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Tuy nhi\u00ean, n\u00f3 \u0111\u1ee7 \u0111\u1ec3 c\u00e1c b\u1ee9c \u1ea3nh ch\u1ee5p ngo\u00e0i \u0111\u1eddi th\u1ef1c tr\u00f4ng \u0111\u1eb9p. Chi ti\u1ebft kh\u00f4ng n\u1ed5i b\u1eadt tr\u00ean trang khi c\u1eaft 100% b\u1ee9c \u1ea3nh n\u00e0y, nh\u01b0ng b\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng n\u00f3 tr\u00f4ng \u1ed5n.<\/p>\n\n\n\n

S\u1ef1 nhi\u1ec5u x\u1ea1 s\u1ebd xu\u1ea5t hi\u1ec7n \u1edf F11 v\u00e0 c\u00e1c b\u1ee9c \u1ea3nh c\u00f3 kh\u1ea9u \u0111\u1ed9 nh\u1ecf h\u01a1n s\u1ebd tr\u00f4ng m\u1ec1m m\u1ea1i h\u01a1n \u0111\u00e1ng k\u1ec3. Sau \u0111\u00e2y l\u00e0 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa F11 v\u00e0 kh\u1ea9u \u0111\u1ed9 t\u1ed1i thi\u1ec3u l\u00e0 F22:<\/a><\/p>\n\n\n

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Khi chuy\u1ec3n sang 35mm, hi\u1ec7u su\u1ea5t \u1edf trung t\u00e2m h\u1ea7u nh\u01b0 v\u1eabn v\u1eady, nh\u01b0ng t\u00f4i th\u1ea5y c\u00f3 m\u1ed9t s\u1ed1 c\u1ea3i ti\u1ebfn \u1edf khung gi\u1eefa v\u00e0 c\u00e1c g\u00f3c, m\u1eb7c d\u00f9 c\u00e1c g\u00f3c v\u1eabn m\u1ec1m m\u1ea1i h\u01a1n khi so s\u00e1nh.<\/p>\n\n\n

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Vi\u1ec7c c\u0103n gi\u1eefa \u1ed1ng k\u00ednh c\u00f3 v\u1ebb t\u1ed1t, v\u1edbi k\u1ebft qu\u1ea3 \u0111\u1ed3ng \u0111\u1ec1u \u1edf c\u1ea3 b\u1ed1n g\u00f3c.<\/p>\n\n\n\n

\u0110\u1ed9 s\u1eafc n\u00e9t \u1edf c\u00e1c g\u00f3c s\u1ebd cao h\u01a1n \u1edf m\u1ee9c 35mm, hi\u1ec7u su\u1ea5t \u1edf c\u00e1c g\u00f3c tr\u00f4ng kh\u00e1 t\u1ed1t \u1edf F5.6.<\/p>\n\n\n

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N\u1ebfu ch\u00fang ta di chuy\u1ec3n tr\u00ean 50mm, ch\u00fang ta s\u1ebd th\u1ea5y hi\u1ec7u su\u1ea5t m\u1ea1nh nh\u1ea5t t\u1eeb \u200b\u200btr\u01b0\u1edbc \u0111\u1ebfn nay. \u0110\u1ed9 s\u1eafc n\u00e9t cao h\u01a1n \u0111\u00e1ng k\u1ec3 \u1edf khung gi\u1eefa v\u00e0 c\u00e1c g\u00f3c (tr\u00f4ng tuy\u1ec7t v\u1eddi!), v\u00e0 th\u1eadm ch\u00ed ph\u1ea7n trung t\u00e2m tr\u00f4ng \u0111\u1eb9p h\u01a1n m\u1ed9t ch\u00fat.<\/p>\n\n\n\n

B\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng nh\u1eefng b\u1ee9c \u1ea3nh ch\u1ee5p th\u1ef1c t\u1ebf \u1edf ti\u00eau c\u1ef1 50mm cho th\u1ea5y \u0111\u1ed9 chi ti\u1ebft v\u00e0 \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n tuy\u1ec7t v\u1eddi.<\/p>\n\n\n\n

70mm v\u1eabn tr\u00f4ng \u0111\u1eb9p, m\u1eb7c d\u00f9 kh\u00f4ng \u0111\u1eb9p b\u1eb1ng 50mm.<\/p>\n\n\n

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\u1ede cu\u1ed1i ph\u1ea1m vi zoom, t\u00f4i th\u1ea5y c\u00f3 m\u1ed9t s\u1ed1 \u0111i\u1ec3m cho v\u00e0 nh\u1eadn so v\u1edbi 70mm. M\u1ed9t s\u1ed1 \u0111i\u1ec3m (khung gi\u1eefa) tr\u00f4ng s\u1eafc n\u00e9t h\u01a1n m\u1ed9t ch\u00fat, trong khi c\u00e1c g\u00f3c tr\u00f4ng m\u1ec1m m\u1ea1i h\u01a1n m\u1ed9t ch\u00fat v\u00e0 ph\u1ea7n trung t\u00e2m tr\u00f4ng g\u1ea7n nh\u01b0 v\u1eady. Nh\u00ecn chung, t\u00f4i cho r\u1eb1ng \u0111\u1ed9 s\u1eafc n\u00e9t v\u00e0 \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n th\u1ea5p h\u01a1n m\u1ed9t ch\u00fat \u1edf 105mm so v\u1edbi c\u00e1c v\u1ecb tr\u00ed kh\u00e1c trong ph\u1ea1m vi zoom.<\/a><\/p>\n\n\n\n

Nh\u00ecn chung, t\u00f4i th\u1ea5y \u0111\u1ed9 s\u1eafc n\u00e9t kh\u00e1 t\u1ed1t \u1edf ti\u00eau c\u1ef1 105mm \u0111\u1ed1i v\u1edbi nh\u1eefng b\u1ee9c \u1ea3nh ch\u1ee5p th\u1ef1c t\u1ebf, m\u1eb7c d\u00f9 \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n kh\u00f4ng ph\u1ea3i l\u00e0 t\u1ed1t nh\u1ea5t.<\/p>\n\n\n\n

\u0110\u00e2y l\u00e0 m\u1ed9t v\u00ed d\u1ee5 kh\u00e1c.<\/p>\n\n\n

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T\u00f4i \u0111\u00e3 th\u1ef1c hi\u1ec7n m\u1ed9t v\u00e0i so s\u00e1nh v\u1edbi Tamron 35-150mm. So s\u00e1nh c\u00e1c \u0111\u1ea7u r\u1ed9ng (28 so v\u1edbi 35mm) cho th\u1ea5y m\u1ed9t s\u1ed1 s\u1ef1 cho v\u00e0 nh\u1eadn gi\u1eefa hai \u1ed1ng k\u00ednh v\u1ec1 \u0111\u1ed9 s\u1eafc n\u00e9t. Tamron s\u1eafc n\u00e9t h\u01a1n \u1edf trung t\u00e2m v\u00e0 gi\u1eefa khung h\u00ecnh, trong khi Sigma s\u1eafc n\u00e9t h\u01a1n m\u1ed9t ch\u00fat \u1edf c\u00e1c g\u00f3c. \u1ede 105mm, Tamron s\u1eafc n\u00e9t h\u01a1n m\u1ed9t ch\u00fat tr\u00ean to\u00e0n b\u1ed9 khung h\u00ecnh.<\/p>\n\n\n\n

\u00cdt nh\u1ea5t l\u00e0 trong c\u00e1c b\u1ea3n sao m\u00e0 t\u00f4i \u0111\u00e3 so s\u00e1nh, t\u00f4i th\u1ea5y r\u1eb1ng Tamron c\u00f3 kh\u1ea3 n\u0103ng l\u00e0m s\u1eafc n\u00e9t h\u01a1n m\u1ed9t ch\u00fat khi b\u1ea1n d\u1eebng n\u00f3 l\u1ea1i. So s\u00e1nh n\u00e0y thi\u00ean v\u1ec1 Tamron h\u01a1n \u1edf kh\u1ea9u \u0111\u1ed9 nh\u1ecf h\u01a1n. Tamron c\u0169ng \u0111\u1eaft h\u01a1n \u0111\u00e1ng k\u1ec3, m\u1eb7c d\u00f9 th\u1eadt \u1ea5n t\u01b0\u1ee3ng khi n\u00f3 gi\u1eef \u0111\u01b0\u1ee3c t\u1ed1t nh\u01b0 th\u1ebf n\u00e0o trong ph\u00e9p so s\u00e1nh n\u00e0y sau ba n\u0103m ph\u00e1t h\u00e0nh. Sau nhi\u1ec1u n\u0103m s\u1eed d\u1ee5ng Tamron, t\u00f4i c\u1ea3m th\u1ea5y Sigma kh\u00f4ng s\u1eafc n\u00e9t v\u00e0 t\u01b0\u01a1ng ph\u1ea3n nh\u01b0 v\u1eady trong c\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf.<\/p>\n\n\n\n

V\u1eady c\u00f2n hi\u1ec7u \u1ee9ng bokeh th\u00ec sao? C\u0169ng nh\u01b0 m\u1ecdi \u1ed1ng k\u00ednh zoom, hi\u1ec7u \u1ee9ng n\u00e0y s\u1ebd ph\u1ee5 thu\u1ed9c v\u00e0o ti\u00eau c\u1ef1. \u0110\u1ea7u tele c\u00f3 kh\u1ea3 n\u0103ng l\u00e0m m\u1edd h\u1eadu c\u1ea3nh l\u1edbn nh\u1ea5t. B\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y t\u1eeb b\u1ee9c \u1ea3nh ch\u1ee5p s\u01b0\u01a1ng s\u1edbm n\u00e0y r\u1eb1ng hi\u1ec7u \u1ee9ng bokeh tr\u00f4ng kh\u00e1 t\u1ed1t.<\/a><\/p>\n\n\n

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C\u00f3 m\u1ed9t s\u1ed1 bi\u1ebfn d\u1ea1ng h\u00ecnh h\u1ecdc \u0111i\u1ec3n h\u00ecnh g\u1ea7n c\u00e1c c\u1ea1nh c\u1ee7a khung h\u00ecnh v\u00e0 t\u00f4i c\u0169ng th\u1ea5y m\u1ed9t s\u1ed1 d\u1ea5u hi\u1ec7u c\u1ee7a “bokeh d\u1ea1ng c\u1ee7 h\u00e0nh” \u1edf \u0111\u00f3 (c\u00e1c v\u00f2ng \u0111\u1ed3ng t\u00e2m b\u00ean trong c\u00e1c \u0111i\u1ec3m s\u00e1ng ph\u1ea3n chi\u1ebfu).<\/p>\n\n\n\n

Nh\u01b0ng trong khi t\u00f4i th\u1ea5y m\u1ed9t ch\u00fat ph\u00e1c th\u1ea3o trong c\u00e1c \u0111i\u1ec3m s\u00e1ng ph\u1ea3n chi\u1ebfu, t\u00f4i c\u1ea3m th\u1ea5y m\u1ed9t s\u1ed1 c\u1ea1nh c\u1ee9ng trong h\u00ecnh \u1ea3nh n\u00e0y \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n kh\u00e1 t\u1ed1t. T\u00f4i kh\u00f4ng c\u00f3 ph\u00e0n n\u00e0n th\u1ef1c s\u1ef1 n\u00e0o \u1edf \u0111\u00e2y.<\/p>\n\n\n

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B\u1ee9c \u1ea3nh ch\u00e2n dung \u0111\u1eddi th\u01b0\u1eddng n\u00e0y c\u1ee7a t\u00f4i cho th\u1ea5y s\u1ef1 b\u1eadn r\u1ed9n h\u01a1n m\u1ed9t ch\u00fat so v\u1edbi mong mu\u1ed1n c\u1ee7a t\u00f4i v\u1ec1 k\u1ebft c\u1ea5u c\u1ee7a nh\u1eefng c\u00e1i c\u00e2y ph\u00eda sau.\"Ezoic\"<\/p>\n\n\n

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T\u00f4i th\u1ea5y \u1ed1ng k\u00ednh zoom 28-45mm F1.8 m\u1edbi nh\u1ea5t c\u1ee7a Sigma c\u00f3 m\u1ed9t s\u1ed1 “\u0111i\u1ec3m \u0111\u1eb7c bi\u1ec7t” trong kh\u1ea3 n\u0103ng hi\u1ec3n th\u1ecb, nh\u01b0ng t\u00f4i kh\u00f4ng m\u1ea5y \u1ea5n t\u01b0\u1ee3ng v\u1edbi \u1ed1ng k\u00ednh n\u00e0y.<\/p>\n\n\n\n

Ng\u01b0\u1ee3c l\u1ea1i, kh\u1ea3 n\u0103ng ch\u1ed1ng l\u00f3a r\u1ea5t tuy\u1ec7t v\u1eddi. T\u00f4i th\u1ea5y kh\u1ea3 n\u0103ng ch\u1ed1ng che ph\u1ee7 ho\u1eb7c b\u00f3ng m\u1edd r\u1ea5t t\u1ed1t, v\u00e0 t\u00f4i ngh\u0129 hi\u1ec7u \u1ee9ng sunburst tr\u00f4ng tuy\u1ec7t v\u1eddi!<\/p>\n\n\n\n

\u0110\u00e2y l\u00e0 m\u1ed9t \u01b0u \u0111i\u1ec3m ch\u1eafc ch\u1eafn c\u1ee7a Tamron v\u00ec n\u00f3 c\u00f3 m\u1ed9t s\u1ed1 v\u1ea5n \u0111\u1ec1 v\u1ec1 l\u00f3a s\u00e1ng.<\/p>\n\n\n\n

\u0110i\u1ec1u n\u00e0y cho ph\u00e9p t\u00f4i ch\u1ee5p th\u1eb3ng v\u00e0o \u00e1nh \u0111\u00e8n s\u00e2n kh\u1ea5u \u1edf rodeo m\u00e0 kh\u00f4ng lo \u1ea3nh b\u1ecb h\u1ecfng.<\/p>\n\n\n\n

M\u1ed9t \u0111i\u1ec3m c\u1ed9ng n\u1eefa l\u00e0 kh\u1ea3 n\u0103ng t\u00e1i t\u1ea1o m\u00e0u s\u1eafc. T\u00f4i r\u1ea5t th\u00edch giao di\u1ec7n t\u1ed5ng th\u1ec3 c\u1ee7a h\u00ecnh \u1ea3nh. T\u00f4ng m\u00e0u da tr\u00f4ng \u0111\u1eb9p v\u00e0 c\u00e1c m\u00e0u kh\u00e1c th\u00ec phong ph\u00fa.<\/a><\/p>\n\n\n

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C\u00f2n xe t\u1ea3i c\u1ee7a t\u00f4i v\u00e0o gi\u1edd v\u00e0ng th\u00ec sao?<\/p>\n\n\n

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V\u00ec v\u1eady, m\u1eb7c d\u00f9 ch\u00fang ta kh\u00f4ng c\u00f3 hi\u1ec7u su\u1ea5t ho\u00e0n h\u1ea3o \u1edf \u0111\u00e2y, ch\u00fang ta c\u00f3 m\u1ed9t m\u00e0n tr\u00ecnh di\u1ec5n quang h\u1ecdc r\u1ea5t t\u1ed1t. \u0110\u00e2y l\u00e0 m\u1ed9t \u1ed1ng k\u00ednh r\u1ea5t c\u00f3 n\u0103ng l\u1ef1c tr\u00ean to\u00e0n b\u1ed9 ph\u1ea1m vi zoom c\u1ee7a n\u00f3, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 Sigma \u0111\u00e3 th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c \u0111i\u1ec1u m\u00e0 th\u1ef1c s\u1ef1 ch\u1ec9 c\u00f3 m\u1ed9t c\u00f4ng ty th\u1ef1c hi\u1ec7n tr\u01b0\u1edbc \u0111\u00e2y. V\u00e0 \u0111\u1eebng qu\u00ean kh\u1ea3 n\u0103ng l\u1ea5y n\u00e9t g\u1ea7n, cho ph\u00e9p b\u1ea1n t\u1ea1o ra m\u1ed9t s\u1ed1 h\u00ecnh \u1ea3nh \u0111\u1ed9c \u0111\u00e1o.<\/p>\n\n\n

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Kh\u1ea3 n\u0103ng n\u00e0y th\u1ef1c s\u1ef1 c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng t\u00ednh h\u1eefu \u00edch c\u1ee7a 28-105 DN nh\u01b0 \u1ed1ng k\u00ednh ch\u00ednh c\u1ee7a nhi\u1ebfp \u1ea3nh gia ch\u1ee5p \u1ea3nh c\u01b0\u1edbi, v\u00ec b\u1ea1n c\u00f3 th\u1ec3 ch\u1ee5p \u1ea3nh chi ti\u1ebft hoa, nh\u1eabn v\u00e0 nhi\u1ec1u th\u1ee9 kh\u00e1c m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea3i r\u00fat \u1ed1ng k\u00ednh macro th\u1ee9 c\u1ea5p ra. N\u1ebfu b\u1ea1n mu\u1ed1n xem th\u00eam h\u00ecnh \u1ea3nh, h\u00e3y xem th\u01b0 vi\u1ec7n \u1ea3nh c\u1ee7a \u1ed1ng k\u00ednh t\u1ea1i \u0111\u00e2y.<\/p>\n\n\n\n

Ph\u1ea7n k\u1ebft lu\u1eadn<\/h1>\n\n\n\n

\u1ed0ng k\u00ednh ph\u00e1 v\u1ee1 th\u1ec3 lo\u1ea1i nh\u01b0 Sigma 28-105mm F2.8 DG DN | ART r\u1ea5t hi\u1ebfm v\u00ec m\u1ed9t l\u00fd do \u0111\u01a1n gi\u1ea3n: ch\u00fang kh\u00f4ng d\u1ec5 ch\u1ebf t\u1ea1o. C\u00f3 r\u1ea5t nhi\u1ec1u h\u1ea1n ch\u1ebf \u0111\u1ed1i v\u1edbi c\u00e1c k\u1ef9 s\u01b0, v\u00ec h\u1ecd c\u1ea7n ki\u1ec3m so\u00e1t k\u00edch th\u01b0\u1edbc, tr\u1ecdng l\u01b0\u1ee3ng v\u00e0 chi ph\u00ed trong khi c\u0169ng c\u1ed1 g\u1eafng thi\u1ebft k\u1ebf \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c s\u1ef1 xu\u1ea5t s\u1eafc v\u1ec1 quang h\u1ecdc tr\u00ean ph\u1ea1m vi zoom l\u1edbn h\u01a1n m\u1ee9c th\u00f4ng th\u01b0\u1eddng. Sigma \u0111ang ch\u1ee9ng minh kh\u1ea3 n\u0103ng c\u1ee7a h\u1ecd v\u1edbi t\u01b0 c\u00e1ch l\u00e0 m\u1ed9t c\u00f4ng ty \u0111\u1ec3 m\u1ed9t l\u1ea7n n\u1eefa th\u00e0nh c\u00f4ng trong vi\u1ec7c gi\u1ea3i quy\u1ebft nh\u1eefng th\u00e1ch th\u1ee9c \u0111\u1eb7c bi\u1ec7t. H\u1ecd l\u00e0 c\u00f4ng ty \u0111\u1ea7u ti\u00ean c\u1ee7a Sony ch\u1ebf t\u1ea1o \u1ed1ng k\u00ednh ch\u00ednh F1.2. C\u00f4ng ty \u0111\u1ea7u ti\u00ean ch\u1ebf t\u1ea1o \u1ed1ng k\u00ednh g\u00f3c r\u1ed9ng F1.4. C\u00f4ng ty \u0111\u1ea7u ti\u00ean ph\u00e1t h\u00e0nh \u1ed1ng k\u00ednh zoom to\u00e0n khung h\u00ecnh F1.8. Danh s\u00e1ch c\u1ee9 d\u00e0i ra m\u00e3i, \u0111i\u1ec1u n\u00e0y cho th\u1ea5y ch\u00fang ta \u0111\u00e3 c\u00e1ch xa c\u00f4ng ty t\u1eebng \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn v\u1edbi vi\u1ec7c ch\u1ebf t\u1ea1o c\u00e1c l\u1ef1a ch\u1ecdn thay th\u1ebf gi\u00e1 r\u1ebb cho \u1ed1ng k\u00ednh c\u1ee7a b\u00ean th\u1ee9 nh\u1ea5t nh\u01b0 th\u1ebf n\u00e0o. \u1ed0ng k\u00ednh 28-105 DN l\u00e0 m\u1ed9t v\u00ed d\u1ee5 \u0111i\u1ec3n h\u00ecnh kh\u00e1c.<\/p>\n","protected":false},"excerpt":{"rendered":"

Sigma 28-105mm F2.8 DG DN | \u0110\u00e1nh gi\u00e1 ART \u1ed0ng k\u00ednh zoom 24-105mm F4 \u0111\u00e3 c\u00f3 \u1edf kh\u1eafp m\u1ecdi n\u01a1i, nh\u01b0ng \u1ed1ng k\u00ednh zoom F2.8 lu\u00f4n c\u00f3 ph\u1ea1m vi zoom 24-70mm b\u1ecb h\u1ea1n ch\u1ebf h\u01a1n. \u0110i\u1ec1u \u0111\u00f3 \u0111\u00e3 d\u1eabn \u0111\u1ebfn v\u00f4 s\u1ed1 cu\u1ed9c c\u00e2n nh\u1eafc gi\u1eefa ph\u1ea1m vi zoom l\u1edbn h\u01a1n c\u1ee7a \u1ed1ng k\u00ednh 24-105mm […]<\/p>\n","protected":false},"author":1,"featured_media":6894,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[537,48,184,187,538],"class_list":["post-6891","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-trai-nghiem-san-pham","tag-28-105","tag-lens","tag-nhiepanhvacongnghe","tag-sigma","tag-sigma-28-105mm-f2-8"],"yoast_head":"\nSigma 28-105mm F2.8 DG DN c\u00f3 nh\u1eefng g\u00ec ? - Nhi\u1ebfp \u1ea2nh V\u00e0 C\u00f4ng Ngh\u1ec7<\/title>\n<meta name=\"description\" content=\"Sigma 28-105mm F2.8 DG DN t\u1ef1 h\u00e0o c\u00f3 d\u1ea3i ti\u00eau c\u1ef1 28-105mm m\u1ea1nh m\u1ebd v\u00e0 kh\u1ea9u \u0111\u1ed9 F2.8 kh\u00f4ng \u0111\u1ed5i, \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t v\u01b0\u1ee3t tr\u1ed9i t\u1eeb g\u00f3c r\u1ed9ng\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/nhiepanhvacongnghe.com\/index.php\/2024\/09\/06\/sigma-28-105mm-f2-8-dg-dn\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sigma 28-105mm F2.8 DG DN c\u00f3 nh\u1eefng g\u00ec ? 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