Quote:
Originally Posted by cometcatcher
What exactly is happening? Are you getting fat bloated stars? It could be UV and IR. If so a UV / IR blocker will help. Or is the bloat caused by CA from the ST80? If that is the case then a Baader semi-apo filter may help, or using an ED refractor for the guidescope.
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Hi Cometcatcher
The brighter stars through the ST80 appear to be Saturated/Haloed.
I'm not sure if its just average optics or UV/IR distorting the image. I have read on LP threads the UV/IR if not filtered can cause this effect.
I am going to take your suggestion and give the Baader APO filter a go, claims to improve contrast while filtering UV/IR.
http://www.ozscopes.com.au/baader-pl...o-filter.html/