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Old 20-08-2015, 04:49 PM
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Shiraz (Ray)
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Shiraz is offline
Join Date: Apr 2010
Location: ardrossan south australia
Posts: 4,822
Originally Posted by rustigsmed View Post
thanks guys,

Ray, I guess good flats would take care of the curvature?

Flats will correct for vignetting, but field curvature will give out-of-focus away from the centre of the fofv. I reckon that the best approach would be to try a Barlow and see what you get - work out what is important from that.

I don't have any feel for how to combine a Barlow and coma corrector - or even if a CC will be necessary over the fields of view that you will be using. Maybe just take JJJ's advice and crop.
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