A single-lens reflex camera (SLR) is a camera that typically uses a mirror and prism system (hence "reflex" from the mirror's reflection) that permits the photographer to view through the lens and see exactly what will be captured. With twin lens reflex and rangefinder cameras, the viewed image could be significantly different from the final image. When the shutter button is pressed on most SLRs, the mirror flips out of the light path, allowing light to pass through to the light receptor and the image to be captured.
History of the single-lens reflex camera
File:Hasselblad 1600F.jpg|[[Medium format]] SLR by [[Hasselblad]] (Model 1600F), Sweden
File:Zenza BRONICA S2 with ZENZANON 100mm F2.8.JPG|Medium format SLR by [[Bronica]] (Model S2), Japan. Bronica's later model—the Bronica EC—was the first medium format SLR camera to use an electrically operated [[focal-plane shutter]]
File:Asahiflex600.jpg|The 1952 ([[Pentax]]) [[Asahiflex]], Japan's first single-lens reflex camera.
File:Contaflex BW 2.JPG|The [[Contaflex]] III a single-lens reflex camera from West Germany from 1957, with additional 115 mm lens
File:Nikonf.jpg|The 35 mm film-based [[Nikon F]], 1959, the world's second single-lens reflex [[system camera]]. The first was [[Kamera-Werkstätten|Kamera-Werke's]] Praktina.
File:Canon pellix.jpg|[[Canon Pellix]], 1965, the first camera to incorporate a stationary pellicle mirror.
File:Honeywell-Pentax-Spotmatic.jpg|The [[Pentax]] Spotmatic IIa, 1971
File:OM-2-2.jpg|[[Olympus Corporation|Olympus]] The 35 mm film-based [[Olympus OM-2]] (1975), which was the first SLR to measure light for electronic flash off the film plane.
File:Casio RF2.JPG|[[Casio]] RF2 35 mm film SLR
File:16-04-09 Nikon F5 RalfR WAT 6948.jpg|[[Nikon F5]] professional SLR, 1996
File:Coolscan-V.jpg|[[Digital photography|Digital SLR]] Nikon D200 and a Nikon [[film scanner]]
File:Image of Russian-made Zennit without lens kit.jpg|Zenit, a Russian brand.
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A single-lens reflex camera (SLR) is a camera that typically uses a mirror and prism system (hence "reflex" from the mirror's reflection) that permits the photographer to view through the lens and see exactly what will be captured. With twin lens reflex and rangefinder cameras, the viewed image could be significantly different from the final image. When the shutter button is pressed on most SLRs, the mirror flips out of the light path, allowing light to pass through to the light receptor and the image to be captured.
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