|Fixed-lens Topcon PR|
image by Akira Nakajima (Image rights)
A simplified SLR from Tōkyō Kōgaku using a leaf shutter and a fixed 50mm, f/2.8 Topcor lens. This is a meterless model. The reflex mirror is not an instant-return type, thus nothing can be seen though the eyepiece until the wind lever is advanced. Auxiliary Topcor telephoto and wide-angle attachments were available to thread into the front of the lens.