Through-the-lens metering
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In photography, through-the-lens metering refers to a feature of cameras whereby the intensity of light reflected from the scene is measured through the lens; as opposed to using a separate metering w
Above viewfinder in the pentaprism box Pentax Spotmatic, Nikon FM, Canon EOS, Zenit-12
Side of the condenser lens Canon F-1
Below the mirror, reflecting off the film or shutter curtain Olympus OM-2, Pentax LX
Swung-up arm behind a transparent pellicle mirror Canon Pellix
Olympus OM-2
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The Olympus OM-2 is a professional single-lens reflex film system camera manufactured by Olympus Optical Co., Ltd., later Olympus Corporation, in Japan between 1975 and 1988.
Through-the-lens metering
…and is then applied during the exposure without any possible real-time feedback. There were a few particularly sophisticated film SLRs including the Olympus OM-2, the Pentax LX, the Nikon F3, and the Minolta 9000, where metering cells located at the bottom of the mirror box were used for ambient light metering…
Olympus OM-2
Olympus OM-2N SLR 35mm film camera
OM-2SP Finger Grip
Olympus OM-2 with Zuiko 50mm f1.8 lens