In a reflex camera lens of photographer see the scene through the lens of the camera. This avoids the problems of parallax, which occurs when viewing the lens or viewfinder is separate from the taking lens. Single-Lens Reflex cameras are made in various formats, including 220/120 and 8, 12 or 16 pictures of roll 120 and twice the number of the film 220. This corresponds to a 6x9, 6x6 and 6x4.5, respectively (all dimensions in cm). A leading manufacturer of large format SLR include Hasselblad, Mamiya, Bronica and Pentax. However, the most common form of SLR cameras is 35 mm and then the migration to digital SLR cameras, with almost identical size bodies, and sometimes with the same lens system.
Nearly all appeared before the SLR uses a mirror in the optical path to direct light through the lens of the viewing screen and pentaprism the eyepiece. During the exposure of the mirror flipped the light off in the prison for the opening. Some early cameras experimenting different methods for viewing through the prism of security, including the use of semi-transparent film in both the Canon Pellix and other small periscope as a series Corfield Periflex
ไม่มีความคิดเห็น:
แสดงความคิดเห็น