camera

The SLR camera the photographer sees the scene through the camera lens. This avoids the problem of parallax which occurs when the viewfinder or screen is separate from the lens. Single-lens reflex has been made in several formats, including sheet film 5x7 "and 4x5" roll film 220/120 is 8.10, 12 or 16 pictures on a roll of 120 and twice as many of the 220 ​​movie. These correspond to 6x9, 6x7, 6x6 and 6x4.5 respectively (all dimensions in cm). Notable manufacturers of large format roll film SLR include Hasselblad BRONICA Graflex, Mamiya and Pentax. However, the most common format of SLRs has been 35 mm and subsequently the migration to digital SLRs, almost identical sized bodies and sometimes using the same lens systems.

Almost all SLR using a front surface mirror in the optical path to direct light from the lens through a screen and eye pentaprism. At the time of exposure the mirror flipped out of the light path before the shutter opened. Some cameras have experienced other methods of delivery through vision lens, including the use of a translucent film Pellix as the Canon [21] and others with a small periscope as the series Corfield Periflex.