rehess wrote:
I have Pentax cameras. They work fine with M42 lenses, which they should because the modern K-mount was designed to make M-42 adapters straight-forward. However, even the official Pentax adapter doesn't provide capability to open the aperture for focusing and then stop down for shooting. Pentax users are heavy users of M42 lenses, and most of us use them totally stopped down .... frankly, that has never caused issues for me.
added: In the spirit of "a picture is worth a thousand words", here is 3000+ words of explanation using my own Super Takumar 50mm f/1.4:
.........................................................................................................................................
I have Pentax cameras. They work fine with M42 len... (
show quote)
Thank you for your effort and the photos. I understand the manual/auto pin. My problem is that I couldn't manually focus on anything more than a foot from the lens. I had it on auto but never even got around to moving to manual mode, which I don't think that would change the focal length unless I'm thinking wrong.