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Message: <blockquote data-quote="jring" data-source="post: 3277355" data-attributes="member: 133897">Hi,yes, looks like fungus - cracks would look different. But with fungus and maybe out of collimation... I hope you didn't pay a lot for those... you want these to be cleaned and collimated professionally before they are any use. You can check collimation by setting the diopter way off - maximal fuzziness for the right eye. Then you watch a bright star or far away light at night and use the focus until you see the light sharp and pointlike in your left eye. Now you should see a bright point with a disc around it. The point should be in the middle of the disc if you bin is in collimation. Your brain tends to match the pictures if your bins are slightly out of collimation (which gives a nice headache after some time) so it has to be fooled by making one picture blurry.Joachim</blockquote>