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CMS-XML What the error warning messages mean in stopped-down photography.
To prevent this before you mount a lens , make sure there is no red dot beside the stop-down coupling lever inside the camera body Second possible problem arises if you push in the camera's stop-down lever and before taking a shot, release the stop-down lever and return the lens aperture ring to the "A" mark. If you then try to press the shutter button, you will notice that neither it no the film advance lever will operate.