The Blair Stereo Weno is an early stereo film camera, a twin-lens stereoscopic design that records paired images on roll film for viewing through a stereo viewer. It dates from the early 20th century, when stereo photography was a popular amateur format alongside conventional roll-film cameras.

Sales data for the Stereo Weno is very thin: a single UK auction hammer result from August 2024 sold for £125, which sets the only recent reference point for what one is worth at saleroom level today. With just one record, there is no meaningful range or median, and the price a given example sells for will swing widely on cosmetic condition, completeness of the bellows and shutter, and whether the original case and viewer are present.