The OLYMPUS AUTO BELLOWS is a movable bellows ideal for macro photography. It's an old item, so it shows its age, but it's in relatively good condition. I don't have an OM mount, so I can't confirm if it's actually usable, but all the moving parts that seem to function have a smooth, mechanical feel. I'm unsure about the extent of the bellows' deterioration. I didn't see any light leaks visually, but actual operation with a lens attached hasn't been confirmed, so please consider it as junk. - Brand: OLYMPUS - Model Name: AUTO BELLOWS - Type: For macro photography - Features: Movable bellows