This quoted from another topic, but I wasn't getting any replies there so I'm sorry for having to post this here. I purchased two manual lenses for my K-x (a Phenix 50mm F1.7, and the other a Phenix 70-210mm). Both are k-mounts and both fit. The 50mm lens works fine - no problems. The telephoto lens however has got serious issues, and I'm not really sure what the problem is. I have followed all the directions with setting it up, and have tried some of the suggestions found elsewhere in other topics at this site. To my dismay however, whenever I use the 210mm lens, it takes one or two photos okay, and then the shutter seems to get stuck. I don't have catch-in-focus enabled, I am only using M or AV mode, I have my focus mode set to C (continuous), the focus switch is set to manual. I really am at a loss here.
See photos of the lens and mount at this thread (last page):
https://www.pentaxforums.com/forums/pentax-beginners-corner-q/110658-using-ma...dslrs-f-4.html
Originally posted by Lowell Goudge
"change the AF focus switch from S (Single) to C (Continuous) or M(Manual) In single the camera will not continually search and adjust focus, but if the subject moves out of focus, the shutter will not trip. This will serve as a good training for your focusing skills, but usually your aperture setting is good enough to gaurantee acceptably sharp photos even if you are off a little, and a slightly less sharp photo is much much better than none at all"
So, I came home and tried it - switching into the different focus modes does NOT solve the problem. I can take a few shots successfully (sometimes just one), and then the shutter seems to get stuck and will not snap a photo. I've even had it get stuck to the point that with any button I press, or dial I turn on my camera - it creates a shutter noise. Either something is really wrong with this mount, or .....(not sure how to finish that thought). Attached are some photos of the lens/mount for any who may be able to give me some advice on this. I really have followed all the directions in setting up my camera to work with manual lenses. The other lens I purchased from the same shop (50mm F1.7) works fine - no problems. Both mounts to me look identical. The only major difference I see is that with the 70mm-210mm lens - the aperture lever does stick out quite a long way. Talking with the shop is a little pointless since they are Chinese. My wife (Chinese) has been trying to help me, but it hasn't been too successful.