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Any chance of condensation on one element or other of the eyepiece? Or dried condensation which has left a residue?
I noticed over the weekend that as soon as I put in my X2 Barlow everything went milky as though it was fogged up. It was not but there must be residue from one of the many times it has been. I have noticed it before but I don't use it very often so I keep neglecting to clean it.
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