Olympus Zuiko Auto-Macro 20mm f/3.5 - Olympus OM bellows Mount

The Olympus Zuiko Auto-Macro 20mm f/3.5 is a specialised high-magnification lens designed for use with the OM system bellows or extension tubes. It is not intended for general photography at infinity, but rather for extreme macro work, capable of achieving magnifications up to 10x or more depending on the extension used. It features the standard OM mount but lacks a focusing helicoid, relying entirely on bellows movement for focus. Used examples should be carefully checked for the condition of the small optical elements, as any haze or fungus will significantly impact high-magnification results. SDS examines the manual aperture diaphragm to ensure the blades are free from oil and snappy in operation. The lens barrel is checked for any signs of impact that might affect the precise alignment required for macro imaging.