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Message: <blockquote data-quote="dalat" data-source="post: 2727908" data-attributes="member: 65207">That's why I asked if it's in- or outside. If it's inside, it can't be much else than fungus (which, according to a recent test, is impossible in a Zeiss FL <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" /> ). If outside, it must be dirt or damage, both of which should be detectable as unevenness of the surface, I guess, seen the extend of these spots.From the photo, it looks rather like it's inside. There are small dust particles clearly are on the outer surface, and compared to those the big spots seem further back. But I think the owner should be easyly able to assess that with the bino in hand.</blockquote>