jamato8
Corroding tank M9 35 ASPH

This is a 100 percent crop. I was using a 50 Summicron on bellows with a visoflex for some close-ups of a very small fruit. When I checked areas I noticed these odd spots, circles that appear to be on or under the cover glass. The sensor has been replaced once for separation of the cover glass from the sensor. The Summicron was set between f11 and f16, 4 second exposure with natural light (need to get a flash because for this type of work I prefer the freezing effect of flash). I use my special magnifier that is made for sensors and I can't see anything but then these are very small. Ideas?
This is the original of the fruit on a US penny:

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