The Gelto series of cameras were a long running line of 127 cameras produced in Japan by Toakoki, beginning in 1936 with the Gelto I and concluding in the early 1950s with the New Gelto D III. Most of the changes made between the models were relatively minor and all Geltos share many characteristics. They each use 127 film to produce 3x4cm frames in portrait orientation. They feature a telescoping lens set in a focusing helicoil. The early Geltos were top loading, with a removable top plate, but later versions switched to a removable back or back/bottom plate combination. All Geltos are scale focus with a viewfinder window for composition only. The frame advance is accomplished via a pair of red windows on the back of the camera, displaying the appropriate frame numbers. The various models feature different shutters that allow a small variety of shutter speed options, but the most common range is 1/5 - 1/250th, with both a "B" and "T" mode. The lenses on these cameras were typically 50mm with either f/3.5 or f/4.5 max apertures.