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I use a Coma Corrector on my 8" f/4 scope purely for imaging though. On my 8" f/6 scope I don't feel it needs it, I haven't noticed any coma at the edges, although I do only have a couple of EP's to choose from.
EDIT: BTW what scope are you using to make you think you need one? I think any Newtonian below f/5 should really use one as the lower the focal ratio the more coma you will get.
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