Olympus OM-4
…highest evolution of the Olympus OM-series SLRs (introduced in 1972). Other Olympus OM top models were the OM-1, OM-2, OM-1N, OM-2N, OM-2 Spot Program, OM-3 and OM-3Ti. They all used the same body configuration, but with developing aluminum alloy chassis, electronics, feature levels, and external controls…