Posted by Paul A Brierley at 06:43 on 2012 Mar 29
A very good friend of mine, uses a H18 CCD camera with this Celestron 8" SCT.He has a curious problem, and I am hoping some of you might have an answer.If you look at the attached image you will see what I mean.My theory is. We are seeing a ghost image, of the SCT corrector, and secondary.But what is the cause and is there a fix.The SCT has been flocked and is carefully collimated. ![](/images_old/fbfiles/images/M95300s.jpg)