Ok, I bought a Pentax PKA Mount, when I put it on my K-r, there is a flashing "F" and when I change the setting to M, it still flashes and will not take a picture. Can someone please help me figure out what I am doing wrong. Thank you!
First, did you make certain the lens was already in the Automatic (A) setting before you mounted the adapter? I found you need to do this. Once the adapter is installed properly, it can still be a little "fiddly" to get the lowest f-stop to show in the viewfinder. Also check the Tamron adaptall part of the forum for more information.