The camera has been converted from four to two lenses and therefore is able to expose two half images"" Belplasca format"" , ie approximately 28.5 mm wide, slides or negative film. I have served you well for a long time. Focal length, to my knowledge, 35mm fixed focus lenses. Stereo base approx. 36 mm. The film speed can be changed between 100 and 400 ASA. Unfortunately I not know what to use batteries, but are 3 buttons. I can investigate request. The camera tends a little underexposure. Attention! If the auction reaches 60 or more euros, also included the original flash unit in its original packaging, and from 80 euros, also included two sets of close-up lenses with 0.75 and 1.5 diopters, an intelligent building Horst Schmela solid. (These items can be viewed in the past 6 photos and are only included in the price limits mentioned!) This is a private sale and warranty, guarantee or return are excluded. If you have any questions about the items, I will be happy to answer it before the end of the auction. Hello, this camera was modified by a friend of mine, Samy Bühlmann (experienced builder cameras) to take two photos larger format instead of 4 very small. I bought the standard version and I modified by Samy. Both Samy and the camera did a good job for me. I do not know how many Nimslos modified such there can not be many so it's a rare collector's item. Stroboscope supply an original and two accessories foreground with him, and the two lenses that have been removed.