Originally posted by sandhilr I have my camera set up for Catch-in Focus Mode as on p. 136 with AF Mode set to AF.A. Also have Drive Mode set to Continuous Shooting Low, use Aperture Priority with the camera set to AF. I never use Live View. Although I did read the manual a couple of times when I first got the K-r (my first dSLR) I still refer to it when I need answers, looks like I'm missing something. When it "locks up", turning the focus ring does nothing and what I see in the viewfinder is just unchanging blur and I can't depress the shutter. Turn the camera off and back on and everything works fine for a few more shots of totally different views/subjects and then it locks up again. I just thought there was something wrong with the lens but maybe it's just me not knowing what I'm doing. Does any of the info I just listed tell you anything? I really do love the results I get with the lens but rarely use it since it is just easier to use an auto focus lens. Thanks to all of you for responding to my post and I hope I have given enough info this time for someone to help be solve my dilemma.
Your shutter may not be tripping because Catch-in-Focus Mode is not detecting anything in focus. Some things to try:
1. Try setting AF Mode to Manual. If that doesn't help, try...
2. Try setting AF Mode to Manual AND turn Catch-In-Focus Mode to OFF
Also, and I'm asking this only because you say this is your only manual focus lens...are you sure that you are turning the focus ring and not the aperture ring on the lens?