The Voigtländer Alpin folding plate cameras were made from 1907 to 1928. The cameras had double or triple extension bellows. A Teletubus with 2½× magnification could be mounted inside the unfolded camera. Tourists liked the camera because it was quite compact when folded, and it was made of light metal.
|9x12cm, Alpin with Kollinear III 6.8/132mm, image by willboy2010 (Image rights)|