Remove the lens and examine the mirror. If there's a speck if something on the mirror, try brushing it away with a very soft brush. Also brush the area of glass into which the mirror is reflecting (even though this will not clear the speck which is on your pictures). If you don't have a soft (and bushy) brush, try a make-up brush (which you have cleaned thoroughly). It would be almost impossible for these areas to be smudged with something unless you touched them. It's usually a small speck of dirt which fell from somewhere in the cavity or lens. DO NOT use canned air.
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