Originally posted by mr tibbs I see, I did not realize that the M42 had contacts that could be delt with. Are the M42 adapters widely available?
No, M42 lenses don't have contacts, I wasn't beuing clear. You need to short the contacts on the
body to get accurate metering with an M42 lens and Av.
But you don't have to do that. I shoot mostly with M42 lenses and I use M mode and the green button (which does meter accurately on my K100D).
M42 adapters are widely available. The original pentax adapter is the best because it fits the mount perfectly (no jiggly attachments), it allows you to have infinity focus and it won't get jammed in the camera. There are third party adapters that are worth using, but they fall down in some aspect - you lose infinity focus, or they are loose, or the retaining spring can get stuck in the camera (the last two have happened to me). IMO the Kood adapter works well as long as you remove the spring (the spring got jammed in my camera and it took me a while to get the adapter out - after removing the spring the adapter works fine, and in some cases
better than the original Pentax adapter).
Richard