Rana: Perbedaan antara revisi

Pada tahun 1925, kamera [[Leica]] A memperkenalkan rana bidang fokal diafragma ganda dengan arah geser celah horizontal.<ref>Jason Schneider, "The Camera Collector: You can't beat the system. Leitz knew that over 50 years ago, and proceeded to give us the world's first 'system 35.'" pp 54-56. ''Modern Photography'', Volume 48, Number 6; June 1984. ISSN 0026-8240.</ref> <ref>Anonymous, "Test: Leica 0-series: What's it like to shoot with a 1923 Leica replica? Inconvenient as hell—and lots of fun!" pp 86-90, 208-209. ''Popular Photography'', Volume 65 Number 9; September 2001. ISSN 0032-4582.</ref> Desain tirai ganda ini disempurnakan pada tahun 1954 dengan munculnya kamera Leica M3<ref>Jason Schneider, "The Camera Collector: I'm still no Leica collector, but the best of 'em exemplify 'form follows function'." pp 50, 52, 54-55. ''Modern Photography'', Volume 47, Number 10; October 1983. ISSN 0026-8240.</ref> <ref>John Wade, ''The Collector's Guide to Classic Cameras: 1945-1985.'' Small Dole, UK: Hove Books, 1999. ISBN 1-897802-11-0. pp 79-80.</ref> dengan [[kecepatan rana]] dari 1 hingga 1/1000 detik.