Originally Posted by
Whir-Click
A lens in a Betax #3 shutter will also be a direct fit in a #3 Alphax shutter.
Just for posterity’s sake, I’ll point out that the Wollensak Series IIIa “EX W. A.” f/12.5 159mm lenses (uncoated, Betax shutter) are a 4/2 design with about 100 degrees coverage stopped down, whereas Wollensak’s post-war “Extreme W. A.” f/12.5 159mm lenses (coated, Alphax or Rapax Shutter) are a 4/4 design with a 90 degree angle of view. Both eminently usable, with trade offs of coverage vs. flare reduction between the two.
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