Forum: Pentax K-3 & K-3 II
07-13-2015, 06:55 AM
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This sounds similar to the problem a lot of people had with extension tubes after the K-5 came out. The mount has to be shorted for the camera to register a lens and actually stop down the aperture for the exposure. Try putting a piece of tin-foil between the lens and mount when you screw on the lens.
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