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Hi Andy
I wouldn't bother with a Coma corrector for a 8" F4.5 , I have a 8" F4 travel scope and gives great images with Naglers ( 13mm and 7mm type 6 ).
So unless you can see your self doing imaging save the money and put it towards some Naglers if you don't already have a few.
Strangely the 13mm Ethos isn't so good and the 24.5 Meade SWAs are bad off axis.
When I had an 18" F4.5 the only time I liked to use a CC was with a 27mm Panoptic , with the 24" F3.6 the Parracorr 2 is needed .
Zane
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