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Also, what do the markings (numbers) mean that are just in front of the mount that do not rotate?
I.e.-16, 11, 8, 4, orange hash mark, 4, red letter "R", 8, 11, 16
Depth of field markings. The region between 4s, or 8s, or 11s, etc, indicate the zone of sharp focus (indicated by the distance scale aligned with it on the rotating part) at those apertures (f/4, f/8, f/11, f/16).