OK, I think I want that M 50/1.7.
From the Pentax Lens Series Explained article:
"Some recent bodies cannot use M and K lenses or only with some limitations. An example are the *ist D and K (digital) series. In M mode you set the aperture using the aperture ring on the lens; the camera will set the shutter speed when you press the green button (or AE-L button if the camera has no green button). Or you can set the shutter speed manually (there is no exposure read out in the finder to assist you)."
So it will work on the K-7? It sounds like I select my aperture using the ring, frame my shot, and press the green button, and the shutter speed will be set (probably will vary depending on the metering mode I have chosen?)? Now, after I let up on the green button, that shutter speed is set, and I can adjust it if I want....do I have that right?
By the way, for Pentax lenses that don't have an A-position, what are the normal increments, or does it vary from lens to lens?