Introduced in 1973 the OM-1 is an all-mechanical SLR. It has a large viewfinder with interchangeable screens but a fixed prism.
Introduced in 1973 the OM-1 is an all-mechanical SLR. It has a large viewfinder with interchangeable screens but a fixed prism. It also has a through-the-lens exposure meter controlling a needle visible in the viewfinder. It has a compact body, essentially retained on later models. The shutter speed dial is located around the lens mount, which allows photographers to keep the camera at the eye between shots more easily than SLRs with the dial located on the top plate. The OM-1 was the first product in the OM Series. It earned wide acclaim as the world's smallest and lightest 35mm single-lens reflex camera. Olympus employed a wide range of innovative ideas to reduce body size and the noise and shock caused by shutter operation. Shutter durability was also improved, resulting in a system capable of withstanding 100,000 operations. The finder screen could be replaced from the lens mount side. Other improvements to the OM-1, included rust prevention technology for the steel materials used to reduce weight, pentaprism processing technology, and heat treatment and surface processing technologies to maximize durability.
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