Not necessarily true IMO. I only use M42 primes with my EOS 630's. Primarily the 50mm 1.4 SMC Takumar, followed by a 135mm 2.5 SMC Takumar, plus a 200mm 3.5 prime and a 28mm prime. Just set the mode to Aperture Priority and adjust the camera aperture value to 1.0. That's it. Whenever you adjust the lens aperture, the camera exposure follows. I am very pleased with the exposures made.
Originally Posted by Rol_Lei Nut