Quote Originally Posted by Karl K View Post
Early in the 1970's, Argus/Cosina introduced the first Pentax thread-mount fully automatic SLR, using standard M42 single-pin lenses and slight pressure on the shutter release button. The meter switched on, the lens stopped down ever-so-quickly, and the proper shutter speed was obtained, automatically. Cosina also badged it as a GAF (Ansco) model.
This Alpa is, I believe, based on that same design.
Karl, Alpha themselves state it was based on a Chinon, they had NO links with Cosina.

The Chinons were at that point well designed and very capable but let down by poor plastics used for some parts. Their standard lenses were exceptionally good.

Ian