Debo Posted February 26, 2019 Share Posted February 26, 2019 Here's a not very inspiring image of M67 (12 x 4min lights) taken with a Borg90FL and a Canon 60Da. Help please, the brighter stars in this image have blue halos, what could cause this problem (camera alignment, telescope lens, poor focus) ? Thanks Link to comment Share on other sites More sharing options...
Adreneline Posted February 26, 2019 Share Posted February 26, 2019 Hi. When I produced images with blue halos I was told it was "blue bloat" (sounds like an unpleasant personal affliction!) and a function of my ED80 optics not being of the highest quality. I was using a UV/IR cut filter with Baader RGB 1.25" filters with a mono CCD. I subsequently had the blue filter replaced by FLO and it made an improvement but the halos were still there; I can never achieve comparable FWHM figures with the blue filter. I am sure your Borg is of much higher optical quality than my ED80 so not likely to suffer from the dreaded bloat. Sorry I cannot be of any help. Adrian Link to comment Share on other sites More sharing options...
Debo Posted February 26, 2019 Author Share Posted February 26, 2019 Thanks for your reply Adrian, it certainly is a bad case of the bloat ?, I'm just wondering where it comes from. Link to comment Share on other sites More sharing options...
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