Recent content by blackdog

I always hate it when I search for problem and find unanswered threads so.. The lens is M42 (or according to the manual occasionally M39). Mine is M42 , weighs an ton and is a real gem.

Hi It's my first post so apologies in advance if a trip over a forum convention or two. I've just bought a 3M-5A 500mm f8 Mirror but there's some confusion over the mount. Lots of places on the net refer to this lens as having an M42 mount, however the seller and a few other places say its a...