Olympus OM-10/20/30/40
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About
The Olympus OM system was released by Olympus in 1972. The Olympus OM bodies were divided in a high range and a middle range. The top range were the one digit models with a hyphen: OM-1/2/3/4. The two digit models were the middle range. All these bodies could take Olympus OM lenses (which means all potentially have DOF preview functionality, as this was standard on most OM Lenses).