The Bentzin Primarflex is a German medium-format single-lens reflex camera using 6x6cm exposures on 120 roll film, introduced in the late 1930s by the Dresden maker Bentzin. It was positioned as a waist-level reflex aimed at advanced amateur and professional users at a time when SLR designs were still uncommon in the medium-format class.

With only two recorded UK auction hammer results — £111 in 2000 and £800 in 2005 — the Primarflex shows a wide spread that reflects how heavily condition, completeness and lens fitment drive what one sells for. As of 2026 the dataset is too thin to fix a reliable median, and any current value estimate at saleroom level should be treated as indicative rather than definitive. Clean, fully working examples with original optics tend to price toward the upper end of that range.