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Look at the unbuttoned shirt button, and you see a change in the pattern from shot to shot, so yes, duty cycle modulation (dithering) as suspected.
Regarding the dirt spots - very likely on your sensor, and thrown out of focus when you use short shutter speed and wide aperture. What were the apertures for the short exposures vs. the long exposure?
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Old TV literature, New York World's Fair, and other miscellany
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