Just bought a lens, schneider krueger 210mm lens. Looked to be in great condition, couldn't see any spots or haze on lens on inspection. Just got a few test sheets back and there's black spots all over it. Not soft, definitely spots. Is this fungus I can't see? Seems to be in the same spot in three of the test photos. The fourth was quite a bit brighter and possibly helped diminish the issue.

Thanks!
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