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Thanks all.
I have skywatcher 150/750 f/5 and I found the edge of the pics the stars look like a comet ..then one day I've read another article for other stuff they talked about coma corrector thats why I have such thought....
reflector
Last edited by malau; 11-03-2014 at 10:10 AM.
Reason: forgot to mention reflector...
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