The CM 7 was made by Cosina which made the FM 10 and Konica TC-X, a different shutter from the CM 7 or Nikon, it used Konica's preferred shutter speed automated exposure. The Alpa, I think was made by Chinon the first generation was M42 the second K mount, it came with a copy of the Kern Swiss 50mm 1.7 macro. Alpa users were not happy as the Japanese Alpas did not use the Swiss Alpa lens mount, in terms of build quality, Chinon was good, but not Alpa good. Sort of an irony, Chinon known for making rebranded bodies and lens, markets a rebranded Cosina.