This is a very special camera: The big knob on top winds a spring that enables it to fire 24 frames in a row. It advances the film and cocks the shutter automatically. It is a kind of spy camera although it is a bit noisy. It is small. It has right angle viewfinder and one feature that is very nice is that the focus ring "clicks" when you go through its scale. This is nice because it enables you to operate it in very low light. If you memorize the sequence, starting at infinit you can go down to 0,7 meters counting the clicks. Lens is a uncoated Biotar f1:2 40mm and the frame is 25 x 25 mm in 35 mm film. One problem is that it has its own cassetes that you must load in darkroom. While shooting film goes from one cassete entirelily to the other.