I happen to have a 50mm 1.7 Pentax-M lens in my legacy collection, and I finally got around to trying it with my new/used K-r today.
I've got the dial on "M" and I think that the way this is working is that if I set the lens, to, say, f8, then press the green button, the K-r automatically selects the correct shutter speed.
That's what it seems like anyway.
Is that correct?
Also, re. focussing in this case (with a Pentax-M), I noticed that when I get the lens focused a small red square appears in the viewfinder. Is that indicating that I'm in focus in the center? So, can I rely on that red square rather than trying to actually see that the image in the viewfinder is sharp (eyes are getting really bad)?
Also, one more thing: I a bunch of M42 lenses and also a couple of M42-to-K-mount adapters. Would the M42 lenses work the same way as above?
Thanks,
Jim
EDIT: One more question: Assuming that the above is correct as far as how the green button works, what do I do in situations where I want to increase exposure (e.g., in a backlit situation)?
Last edited by ohaya; 02-05-2016 at 08:24 PM.
Reason: Added one more ques