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Message: <blockquote data-quote="STM" data-source="post: 123914" data-attributes="member: 12827">This seems backwards to me, perhaps I read this wrong. It seems to me that something else is going on here.  If you say your camera is actually shooting at ASA 3600 instead of ASA 100, then your exposures should be nearly black, because it would be underexposing by 5 f/ stops not overexposing. Is there any chance your aperture blades are sticking? I had this happen to me about two years ago when the aperture blades on my 30 year old 55mm f/2.8 AIS Micro-Nikkor were sticking open due to a little oil buildup, an apparent common issue with this lens of that vintage. A quick trip to the camera repair shop fixed the problem</blockquote>