lot of 3 antique Transposing Frames ("châssis alterneur") for stereo photography + 1 contact printing frame A negative taken with a two-lens stereo camera will have its two images transposed at the taking stage. To be viewed correctly, the image from the right-hand lens must be on the right side of the print or transparency. By using a transposing frame, every image can be printed in its correct position. Offered here a lot of 3 antique Transposing Frames for stereo photography 1 - stereo 45x107mm format (184x60x15mm, 101g) 2 - stereo 6x13cm format (230x98x15mm, 231g) 3 - stereo 8x17cm format (260x102x17mm, 303g) (clear glass is useful for working with film instead of glass plates). also included: 4 - French 6½x9cm contact printing frame "Mackenstein, Paris, Brevété S.G.D.G." (120x122x17mm, 164g) wood, brass and glass, complete, fully functionally very clean, good condition shipping method: Post Office or GLS (depending on your country) registered, with track and trace on internet in case you buy 2 or more lots I will combine shipping and will refund you the overpaid postage