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Thanks again for the reply,
Yes, makes better sense now.
Never heard of coma corrector, but have just done some research into what you said.
That being said, i don't know yet how you worked out from the focal ratio if the scope may have coma, with the one i was looking at being 1200mm.
I guess that might be for a bit later when i learn/research more.
Also found out you need less magnification if you i was to try and view nebular or similar. All to do with letting more light in, 10" would be better than 8" Think i have got that part right.
But also not to try and get too much magnification that the scope can handle,
Think that is all correct.
I am thinking if using a collapsible, it would be best to invest in a light shroud, unless they are not really necessary if there are no bright lights around.
Thanks again for the links and advice, learning heaps pretty quick.
Appreciated.
Peter.
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