Originally posted by riff The official instructions with the Pentax adapter are attach adapter to camera body, then screw the lens in.
Unless, of course, you have one where the instructions say to attach the adapter to the lens first (I have one of each) or a camera manual that suggests adapting the lens rather than the camera (my KX film camera manual, page 28). I ALWAYS put the adapter on the lens first and snug it with a K-mount back cap. It is so much easier to mount to the camera that way.
The SRB adapter is highly regarded and supposed to be first rate. I am surprised that it is giving the OP grief. As for the index mark on the lens not lining up vertical to the body...welcome to the world of M42 lenses. I have a ton of them (Pentax, Mamiya/Sekor, Rikenon, Vivitar, and FSU) and there is wide variability involving both bodies and lenses. My later-version Pentax SV lines up perfectly with my early Super-Tak 55/1.8, but put my other (newer) Super-Tak 55/1.8 on the same camera and it snugs up several degrees earlier. Ditto for the newer lens on my Pentax SPII. Nothing lines up on the Mamiya/Sekor 1000 DTL or the Ricoh Singlex. The Pentax Spotmatic lines up perfect with the Vivitar 28/2.8, but not with any of the Taks. Of my two genuine Pentax M42 adapters, neither lines up with any of the Taks, but all of my Vivitars line up perfectly, but only with one of my two adapters. Go figure...
Steve
Last edited by stevebrot; 10-04-2012 at 09:38 PM.