{"id":20,"date":"2012-08-22T15:08:32","date_gmt":"2012-08-22T15:08:32","guid":{"rendered":"http:\/\/camerapedia.ro\/?p=20"},"modified":"2012-08-22T15:08:32","modified_gmt":"2012-08-22T15:08:32","slug":"f-stop","status":"publish","type":"post","link":"https:\/\/juverdeanu.ro\/blog\/f-stop","title":{"rendered":"F-stop"},"content":{"rendered":"

F-stop este setarea care m\u0103soar\u0103 deschiderea diafragmei pe o lentil\u0103. Este invers propor\u021bional cu deschiderea diafragmei, l\u0103s\u00e2nd mai mult\u0103 lumin\u0103 atunci c\u00e2nd devine mai mare.<\/p>\n

Practic, este vorba de raportul dintre distan\u021ba focal\u0103 a lentilei cu diametrul diafragmei. Se spune despre o lentil\u0103 c\u0103 este \u201elarg deschis\u0103\u201d (wide open) atunci c\u00e2nd este setat\u0103 pe cel mai mic f-stop, sau c\u00e2nd deschiderea diafragmei este cea mai mare.<\/p>\n

\u00cen mod normal, cel mai mic f-stop este de 2 sau 2.8 pentru o lentil\u0103 de 35mm. De aici el cre\u0219te progresiv: 4-5,6-8-11-16-22. Unele lentile ajung doar la f\/16, \u00een timp ce altele (cum ar fi lentilele mari folosite pe camera de luat vederi (view cameras)) ar putea cobor\u00ee p\u00e2n\u0103 la f\/22, f32, f\/45 sau chiar f\/64.<\/p>\n

Pentru a face munca mai u\u0219oar\u0103, se pare c\u0103 fiecare f-stop las\u0103 de dou\u0103 ori mai mult\u0103 lumin\u0103 s\u0103 intre dec\u00e2t urm\u0103torul, \u0219i jum\u0103tate fa\u021b\u0103 de cel anterior. Acest lucru face mai simpl\u0103 ajustarea expunerii prin selectarea timpului de expunere \u0219i a combina\u021biilor f-stop: de exemplu, plec\u00e2nd de la f\/11 p\u00e2n\u0103 la f\/8 g\u0103sim acela\u0219i efect de expunere ca \u0219i cum am fi selectat de la 1\/250 timp de expunere la 1\/125. Urm\u0103toarele combina\u021bii vor da aceea\u0219i expunere pe film:<\/p>\n

f\/11 la 1\/125 sec; f8 la 1\/250 sec; f\/5.6 la 1\/500 sec.<\/p>\n

Cu c\u00e2t este mai rapid\u0103 lentila, cu at\u00e2t este mai mic num\u0103rul f-stop. Lentilele rapide pentru camere de 35mm ar putea fi de f\/1.8, f\/1.4 sau chiar f\/1.2.<\/p>\n","protected":false},"excerpt":{"rendered":"

F-stop este setarea care m\u0103soar\u0103 deschiderea diafragmei pe o lentil\u0103. Este invers propor\u021bional cu deschiderea diafragmei, l\u0103s\u00e2nd mai mult\u0103 lumin\u0103 atunci c\u00e2nd devine mai mare. Practic, este vorba de raportul dintre distan\u021ba focal\u0103 a lentilei cu diametrul diafragmei. Se spune despre o lentil\u0103 c\u0103 este \u201elarg deschis\u0103\u201d (wide open) atunci c\u00e2nd este setat\u0103 pe cel… Continu\u0103 lectura F-stop<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2093],"tags":[2102,2099,2092,2103,869,2094,2100,2097],"yoast_head":"\nF-stop<\/title>\n<meta name=\"description\" content=\"F-stop este setarea care m\u0103soar\u0103 deschiderea diafragmei pe o lentil\u0103.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/juverdeanu.ro\/blog\/f-stop\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"F-stop\" \/>\n<meta property=\"og:description\" content=\"F-stop este setarea care m\u0103soar\u0103 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