Olympus's consumer OM SLR — the OM-20, aperture-priority auto plus built-in manual, OM mount, 1983.
The Olympus OM-20 is a 35mm film SLR from Olympus, a consumer double-digit OM body that followed the OM-10 in the amateur line. Released in 1983 and sold in some markets as the OM-G, it added built-in manual exposure control that the OM-10 had lacked without an accessory. It sat as a step up in the consumer OM range while keeping the compact OM form.
In specification terms, the OM-20 is a single-lens reflex for 35mm film using the Olympus OM mount, with an electronically-controlled focal-plane shutter. It offers both aperture-priority automatic and manual exposure modes, with the manual mode built in rather than requiring a plug-in adapter. Metering is through-the-lens centre-weighted, and exposure information is shown by LEDs in the viewfinder. Because the shutter timing is electronic, the camera depends on battery power to fire correctly.
The OM-20 suits students, beginners and general users who want a compact automatic SLR but also want manual control available directly on the body. It handles travel, street and everyday work well and gives access to the broad OM lens system. The built-in manual mode makes it a more flexible learning camera than the OM-10 while remaining simple to operate in automatic.
When buying used, note the electronic shutter means the camera needs working batteries and will not fire properly if they are flat or corroded, so confirm it powers up and both auto and manual modes respond with the LED display working. Expect perished foam light seals and mirror-damper foam typical of OM bodies and budget for a reseal. Test the shutter across speeds, inspect the prism for haze or desilvering, and check the film advance, rewind and focusing screen for wear or damage.