The Olympus Pen EF is a half-frame 35mm compact camera from the Pen series, fitting two exposures onto a single frame of standard 135 film. It was a fixed-lens viewfinder model aimed at casual users who wanted economical shooting from a roll.

With only one tracked UK auction hammer result, pricing for the Pen EF in 2026 is thinly documented: a single example sold for £112 at saleroom level in late 2025. Because that figure is a wholesale auction result rather than a dealer asking price, retail value in shops or online listings can sit higher, and condition of the lens, shutter and body cosmetics will move what any individual Pen EF sells for.