<\/p>\n\n\n\n
C\u00e1c b\u1ea1n \u1ea3nh, khi c\u1ea7m tr\u00ean tay\u00a0chi\u1ebfc m\u00e1y\u00a0\u1ea3nh d\u00f9ng phim 35mm\u00a0\u0111\u1ea7u ti\u00ean,\u00a0\u0111\u1ea1i\u00a0\u0111a s\u1ed1\u00a0\u0111\u1ec1u\u00a0\u0111\u01b0\u1ee3c g\u1eafn k\u00ednh 50mm. C\u00f3 bao gi\u1edd b\u1ea1n t\u1ef1 h\u1ecfi l\u00ed do v\u00ec sao ti\u00eau c\u1ef1 50mm l\u1ea1i ph\u1ed5 d\u1ee5ng \u0111\u1ebfn nh\u01b0 v\u1eady?<\/p>\n\n\n\n
Ng\u01b0\u1eddi \u1ee9ng d\u1ee5ng ti\u00eau c\u1ef1 50mm n\u00e0y v\u00e0o s\u1ea3n ph\u1ea9m nhi\u1ebfp \u1ea3nh th\u01b0\u01a1ng m\u1ea1i \u0111\u1ea1i tr\u00e0 l\u00e0 cha \u0111\u1ebb c\u1ee7a h\u00e3ng Leica, \u00f4ng Oskar Barnack. Oskar Barnack, sau khi ch\u1ebf t\u00e1c ra chi\u1ebfc m\u00e1y \u1ea3nh d\u00f9ng phim 35mm \u0111\u1ea7u ti\u00ean tr\u00ean th\u1ebf gi\u1edbi, \u0111\u00e3 t\u00ecm ki\u1ebfm m\u1ed9t \u1ed1ng k\u00ednh c\u00f3 ti\u00eau c\u1ef1 t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a t\u1ea5m phim n\u00e0y (35mmx24mm), t\u1ee9c l\u00e0 43,3mm, \u0111\u1ec3 trang b\u1ecb cho chi\u1ebfc m\u00e1y \u1ea3nh s\u01a1 khai.<\/p>\n\n\n\n
V\u00ec sao \u00f4ng ta ph\u1ea3i l\u1ef1a ch\u1ecdn nh\u01b0 v\u1eady? V\u00ec theo c\u00e1c ph\u00e9p t\u00ednh quang h\u00ecnh h\u1ecdc, s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa \u1ed1ng k\u00ednh v\u00e0 khu\u00f4n h\u00ecnh c\u00f3 ti\u00eau c\u1ef1 v\u00e0 \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau s\u1ebd cho ta khung c\u1ea3nh c\u00f3 t\u01b0\u01a1ng quan kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c v\u1eadt gi\u1ed1ng v\u1edbi m\u1eaft ng\u01b0\u1eddi nh\u1ea5t. T\u01b0\u01a1ng quan kho\u1ea3ng c\u00e1ch n\u00e0y ch\u00ednh l\u00e0 s\u1ef1 xa g\u1ea7n bi\u1ec3u ki\u1ebfn c\u1ee7a v\u1eadt g\u1ea7n v\u00e0 v\u1eadt xa ta khi nh\u00ecn. D\u00f9ng k\u00ednh qu\u00e1 d\u00e0i, t\u01b0\u01a1ng quan n\u00e0y ng\u1eafn l\u1ea1i, ta c\u00f3 c\u1ea3m gi\u00e1c hai v\u1eadt g\u1ea7n nhau h\u01a1n th\u1ef1c t\u1ebf. D\u00f9ng k\u00ednh g\u00f3c qu\u00e1 r\u1ed9ng, t\u01b0\u01a1ng quan n\u00e0y d\u00e0i h\u01a1n, ta c\u00f3 c\u1ea3m gi\u00e1c hai v\u1eadt xa nhau h\u01a1n th\u1ef1c t\u1ebf. V\u1edbi s\u1ef1 k\u1ebft h\u1ee3p \u0111\u00e3 n\u00f3i, t\u01b0\u01a1ng quan xa g\u1ea7n bi\u1ec3u ki\u1ebfn tr\u00ean h\u00ecnh s\u1ebd \u0111\u00fang v\u1edbi m\u1eaft ng\u01b0\u1eddi nh\u00ecn nh\u1ea5t. \u0110\u00e2y \u0111\u01b0\u1ee3c xem l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 quan tr\u1ecdng, gi\u00fap ng\u01b0\u1eddi ta l\u00e0m quen v\u1edbi m\u00e1y \u1ea3nh thu\u1edf s\u1edf khai m\u1ed9t c\u00e1ch d\u1ec5 d\u00e0ng h\u01a1n.<\/p>\n\n\n\n
Nh\u01b0 \u0111\u00e3 n\u00f3i, Oskar Barnack c\u1ed1 \u00fd t\u00ecm m\u1ed9t \u1ed1ng k\u00ednh th\u1ecfa m\u00e3n y\u00eau c\u1ea7u tr\u00ean, nh\u01b0ng th\u1eadt kh\u00f4ng may, \u00f4ng ta kh\u00f4ng t\u00ecm th\u1ea5y k\u00ednh n\u00e0o c\u00f3 ti\u00eau c\u1ef1 g\u1ea7n v\u1edbi \u0111\u1ed9 d\u00e0i 43,3mm h\u01a1n \u1ed1ng k\u00ednh 50mm f3.5 m\u00e0 h\u00e3ng Leitz \u0111ang c\u00f3 s\u1eb5n. V\u1eady l\u00e0 \u00f4ng ta l\u1ea5y k\u00ednh n\u00e0y \u0111\u1ec3 g\u1eafn cho chi\u1ebfc Leica \u0111\u1ea7u ti\u00ean.<\/p>\n\n\n\n
\u0110\u00f3 l\u00e0 s\u1ef1 l\u1ef1a ch\u1ecdn c\u1ee7a Oskar, nh\u01b0ng v\u00ec sao t\u1ea5t c\u1ea3 c\u00e1c h\u00e3ng m\u00e1y \u1ea3nh kh\u00e1c l\u1ea1i ph\u1ea3i tu\u00e2n theo s\u1ef1 l\u1ef1a ch\u1ecdn n\u00e0y? Th\u1ef1c t\u00ecnh, h\u1ecd kh\u00f4ng c\u00f3 s\u1ef1 l\u1ef1a ch\u1ecdn n\u00e0o kh\u00e1c t\u1ed1t h\u01a1n c\u1ea3. H\u1ecd mu\u1ed1n ch\u1ebf t\u00e1c c\u00e1c \u1ed1ng k\u00ednh c\u00f3 ti\u00eau c\u1ef1 43,3mm l\u1eafm ch\u1ee9, ho\u1eb7c gi\u1ea3 43mm, 42mm, 40mm c\u0169ng \u0111\u01b0\u1ee3c. V\u1ea5n \u0111\u1ec1 \u1edf ch\u1ed7, th\u00e2n m\u00e1y \u1ea3nh c\u00f3 m\u1ed9t \u0111\u1ed9 d\u00e0y nh\u1ea5t \u0111\u1ecbnh, \u0111\u1ed9 d\u00e0y n\u00e0y quy\u1ebft \u0111\u1ecbnh \u0111\u1ed9 d\u00e0i h\u1ed9i t\u1ee5 c\u1ee7a \u00e1nh s\u00e1ng t\u1eeb \u1ed1ng k\u00ednh l\u00ean t\u1ea5m phim (flange focal distant). \u0110\u1ed9 d\u00e0i h\u1ed9i t\u1ee5 n\u00e0y tr\u00ean c\u00e1c m\u00e1y d\u00f9ng phim 35mm x\u00ea d\u1ecbch trong kho\u1ea3ng 30mm \u0111\u1ebfn 50mm. \u0110\u1ec3 l\u00e0m c\u00e1c \u1ed1ng k\u00ednh c\u00f3 ti\u00eau c\u1ef1 ao \u01b0\u1edbc tr\u00ean m\u00e0 v\u1eabn \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 d\u00e0i h\u1ed9i t\u1ee5 trong kho\u1ea3ng \u0111\u00f3, h\u1ecd ph\u1ea3i hy sinh c\u00e1c kh\u1ea9u \u0111\u1ed9 l\u1edbn tr\u00ean \u1ed1ng k\u00ednh, v\u00ec y\u00eau c\u1ea7u thi\u1ebft k\u1ebf kh\u00f4ng cho ph\u00e9p.<\/p>\n\n\n\n
M\u00e1y c\u00f3 \u0111\u1ed9 d\u00e0i h\u1ed9i t\u1ee5 c\u00e0ng l\u1edbn th\u00ec kh\u00f3 kh\u0103n n\u00e0y c\u00e0ng gay g\u1eaft. V\u00ec l\u1ebd \u0111\u00f3, ti\u00eau c\u1ef1 50mm \u0111\u00e3 \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o v\u1eb9n to\u00e0n c\u00e1c y\u00eau c\u1ea7u: T\u01b0\u01a1ng quan xa g\u1ea7n bi\u1ec3u ki\u1ebfn c\u1ee7a \u1ea3nh t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi m\u1eaft ng\u01b0\u1eddi nh\u00ecn; V\u00e0 chi ph\u00ed s\u1ea3n xu\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i r\u1ebb ti\u1ec1n m\u00e0 v\u1eabn c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c kh\u1ea9u \u0111\u1ed9 l\u1edbn f1.8, f1.4 ho\u1eb7c th\u1eadm ch\u00ed f1.2.<\/p>\n\n\n\n
C\u0169ng v\u00ec l\u1ebd n\u00e0y m\u00e0 c\u00e1c h\u00e3ng s\u1ea3n xu\u1ea5t m\u00e1y \u1ea3nh tr\u1eafc vi\u1ec5n k\u00ednh d\u00f9ng phim 35mm, c\u00f3 \u0111\u1ed9 d\u00e0i h\u1ed9i t\u1ee5 nh\u1ecf kho\u1ea3ng 30mm \u0111\u1ebfn 35mm, c\u00f3 th\u1ec3 ch\u1ebf t\u00e1c c\u00e1c lo\u1ea1i \u1ed1ng k\u00ednh ti\u00eau c\u1ef1 30mm, 35mm, 40mm c\u00f3 \u0111\u1ed9 m\u1edf v\u00f4 c\u00f9ng to l\u1edbn \u0111\u1ebfn f1.4. \u0110\u00e2y kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t \u0111i\u1ec1u g\u00ec gh\u00ea g\u1edbm v\u1ec1 c\u00f4ng ngh\u1ec7 c\u1ee7a h\u1ecd c\u1ea3. C\u00e1c h\u00e3ng m\u00e1y \u1ea3nh kh\u00e1c \u0111\u1ee7 kh\u1ea3 n\u0103ng \u0111\u1ec3 l\u00e0m \u0111i\u1ec1u \u0111\u00f3, nh\u01b0ng v\u1ea5n \u0111\u1ec1 l\u00e0 h\u1ecd s\u1ea3n xu\u1ea5t nh\u1eefng chi\u1ebfc m\u00e1y \u0111\u01a1n k\u00ednh ph\u1ea3n chi\u1ebfu c\u00f3 bu\u1ed3ng g\u01b0\u01a1ng to l\u1edbn t\u1eeb 45mm \u0111\u1ebfn 50mm, h\u1ecd kh\u00f4ng c\u00f3 s\u1ef1 l\u1ef1a ch\u1ecdn.<\/p>\n\n\n\n
14\/11\/2015<\/em><\/p>\n","protected":false},"excerpt":{"rendered":" C\u00e1c b\u1ea1n \u1ea3nh, khi c\u1ea7m tr\u00ean tay\u00a0chi\u1ebfc m\u00e1y\u00a0\u1ea3nh d\u00f9ng phim 35mm\u00a0\u0111\u1ea7u ti\u00ean,\u00a0\u0111\u1ea1i\u00a0\u0111a s\u1ed1\u00a0\u0111\u1ec1u\u00a0\u0111\u01b0\u1ee3c g\u1eafn k\u00ednh 50mm. C\u00f3 bao gi\u1edd b\u1ea1n t\u1ef1 h\u1ecfi l\u00ed do v\u00ec sao ti\u00eau c\u1ef1 50mm l\u1ea1i ph\u1ed5 d\u1ee5ng \u0111\u1ebfn nh\u01b0 v\u1eady? Ng\u01b0\u1eddi \u1ee9ng d\u1ee5ng ti\u00eau c\u1ef1 50mm n\u00e0y v\u00e0o s\u1ea3n ph\u1ea9m nhi\u1ebfp \u1ea3nh th\u01b0\u01a1ng m\u1ea1i \u0111\u1ea1i tr\u00e0 l\u00e0 cha \u0111\u1ebb c\u1ee7a […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[102,106,94],"class_list":["post-291","post","type-post","status-publish","format-standard","hentry","category-all","tag-leica","tag-oskar-barnack","tag-saigon-analogue"],"_links":{"self":[{"href":"https:\/\/nvbach.com\/index.php?rest_route=\/wp\/v2\/posts\/291","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nvbach.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nvbach.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nvbach.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nvbach.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=291"}],"version-history":[{"count":2,"href":"https:\/\/nvbach.com\/index.php?rest_route=\/wp\/v2\/posts\/291\/revisions"}],"predecessor-version":[{"id":409,"href":"https:\/\/nvbach.com\/index.php?rest_route=\/wp\/v2\/posts\/291\/revisions\/409"}],"wp:attachment":[{"href":"https:\/\/nvbach.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=291"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nvbach.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=291"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nvbach.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=291"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}