The Bentzin Stereo-Focal Primar is a stereo camera produced by the German maker Bentzin, designed to capture paired images for three-dimensional viewing. It is an early-twentieth-century plate-format instrument aimed at amateur and enthusiast stereo photographers of its era.

Auction evidence for the Stereo-Focal Primar is extremely thin: the only recorded UK saleroom hammer result on file is £300 from 2003, so today there is no reliable median or range to quote. Buyers asking what a Stereo-Focal Primar is worth or how much one sells for in 2026 should treat that figure as a historical data point rather than a current value, and expect price to depend heavily on completeness, shutter function and cosmetic condition when one next appears at auction.