Abstract: A lens tube guide frame holds a retractable lens tube in the body of the camera and also holds a lens and a film surface in their respective correct positions for making exposures. The lens tube guide frame can be easily inserted in the body of the camera and includes a standard surface at its front inner wall opposite the open side of the lens tube guide frame to provide an exact stop for forward movement of the lens tube. The guide frame cross section is U-shaped or box-shaped, and has two projection portions directed outwards at the open rear end to engage adjacent side walls of the camera body. The lens tube guide frame, with the lens tube already in it, is inserted into the camera body through the back side when assembling, whereby the lens tube guide frame can be positioned without any adjustment.