The Beier-Flex is a roll-film twin-lens reflex camera produced by the German maker Beier. It sits within the wider family of mid-twentieth-century European TLRs, a body type built around a waist-level reflex viewfinder and a separate taking lens.

Sales data for the Beier-Flex is extremely thin: a single UK auction hammer result of £188 from 2001 is the only reference point available, so any statement of what one is worth today carries unusual uncertainty. At saleroom level the model trades infrequently, and in 2026 a current price guide cannot be reliably drawn from one twenty-five-year-old sale. Condition, completeness of the leather and viewing hood, and a working shutter would all materially affect what a Beier-Flex sells for if another example surfaced.