northcanadian Posted April 28, 2015 Share Posted April 28, 2015 Hi all:Thought I had this ASI 120mm sensor glass cover cleaned prior to last imaging session. I blew it off then cleaned with isopropyl alcohol, blew it off again...didn't see any dark spots when I ran the camera in low light thru the rgb filters. Last imaging session there they were again. Today cleaned sensor a few times, ran camera in low light and didn't see any motes. However when I put in a 2x barlow and did the same...there they were again! Cleaned barlow, cleaned filters, but still there. what am I doing wrong??? Appreciate any help on this (as usual)This is through the L filter and 2x barlowCheersRoger Link to comment Share on other sites More sharing options...
Demonperformer Posted April 28, 2015 Share Posted April 28, 2015 I suspect it is virtually impossible to make all your filters/lenses clear of all these imperfections. It is these artifacts that your flat frames will get rid of from your final image (I think). Link to comment Share on other sites More sharing options...
PeterCPC Posted April 28, 2015 Share Posted April 28, 2015 I had a "blob" that I could not locate anywhere in the image train - my conclusion was that it was the laptop screen. It did not show on the final image.Peter Link to comment Share on other sites More sharing options...
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