Originally posted by Fl_Gulfer I would buy only a Pentax brand adapter. I have had one in the past, and on my KX, it worked just fine. These adapters will give you only stop down metering on a K mount camera, as there is no actuating flange for the aperture pin.
- If your lens has an auto manual switch, no problems.
- If your lens has a double f/stop ring - a preset lens - you have no problems.
- If your lens has neither of the above, but stops down as you move the aperture ring while off the camera, you have no problems.
- If the lens does not stop down when you move the aperture ring, while it is off the camera, you will only be able to use it wide open, without some means of keeping the pin that actuates the aperture pushed into the lens.