The Corfield Periflex 3b is a British 35mm film camera made by K.G. Corfield. It belongs to the Periflex line, which used a periscope-style focusing device that descended through the lens mount in place of a conventional reflex mirror.

Sales data for the Periflex 3b is thin, so any guide to what it is worth today rests on a narrow base: a single UK auction hammer result of £225 in September 2025 sets the only recent reference point for what the camera sells for at saleroom level. Buyers should expect that price to move with cosmetic condition and the presence of a working periscope, and additional results would be needed before a reliable range or median can be quoted.