Nikkor-Q 1:3.5 f=135mm Nippon Kogaku Japan for Bronica 6x6
An early short telephoto with angle of view equivalent to a 75mm lens on 135 format.
Some lenses lack the square shield behind the rear element - not sure if this is a piece which easily falls out and goes missing, or if it was a change to the lens design.
- Early lenses have the focal length marked f=13.5cm.
- Later lenses are marked f=135mm.
- Very late lenses lack index lines on aperture scale.