Originally posted by bjake Sears 28mm f2.8 pk mount aperture works smooth and proper when off the camera but goes wide open when on the camera when in manual mode.Same lens worked properly yesterday. Thanks, Jake
It shouldn't stop down until you actually shoot, so what you are describing is completely normal. This is the intended behavior unless the lens has a auto/manual diaphragm mount, which almost no K-mount lenses do.
Adam
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