Technical Details
Of the many features the OM-2 boasted in most promotional literature, the mostly commonly advertised feature is that it was the first camera to offer a TTL direct metering system for film, named Auto Dynamic Metering (ADM). This "off the film" was the first ever, (the Contax RTS was second). Another feature of the OM-2 was the integration of two available electronic flash guns into the system. The camera set the duration and intensity of the flash during exposure using its inbuilt sensors by measuring the amount of light reaching the film. This ensured excellent results under difficult conditions. Exposure calculation was unique thanks to the twin "blue cell" sensors which measured light reflected off a paint splatter-patterned surface on the lens side of the shutter for shutter speeds above 1/60 s while exposure was calculated from light reflected off the film surface during the actual exposure for shutter speeds below 1/60 s. The camera also offered a manual light-meter mode, as with the OM-1.
The OM-2 has electronic shutter control but is still mechanical enough to expose without a battery at one speed, 1/60th of a second.
Read more about this topic: Olympus OM-2
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