- 57 Diax Ib, has interchangeable lens capability, but no rangefinder.
Instead, it has 3 seperate viewfinders for different focal lengths
similar to the Ia, (The Ia has 45-50mm, 35mm and 90mm viewfinders
whereas the Ib has 50mm, 35mm, and 85-90mm). Differences from the
Ia are the rapid wind lever and cosmetic changes to the top plate
of the camera body. This version has an Isco-Gottingen
Isconar f4.5 85mm lens in a Synchro - Compur shutter. The lenses for
the a and b series cameras are intechangeable but turned 90 degrees.