I am thinking of getting a Barlow (
http://www.bintel.com.au/Eyepieces-a...oductview.aspx) to reduce the FOV and gain better detail on some of the larger galaxies such as M83. i am not sure how i would connect this to my Canon 600d, but i will talk to the guys at Bintel for that. my main question is, what will happen with coma ... my newt is a F4 10" and when left uncorrected it has some significant coma. will a barlow eliminate coma (effectively making it F8) or will i still need to connect my coma corrector, however that would work.