The Steinheil Stereo Detective is an early stereo plate camera, produced for capturing paired images on glass plates for stereoscopic viewing. Steinheil of Munich, better known as an optical maker, built it as a detective-style stereo body within the late nineteenth and early twentieth century plate-camera tradition.

Auction data for the Stereo Detective is extremely thin: a single UK saleroom hammer result of £15,625 is on record, with no recent comparable to confirm where the value sits today. With only one data point, that figure should be read as an indicative wholesale auction outcome for an exceptional example rather than a reliable guide to what the camera is worth or sells for in the wider market.