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Hmmmmm - 5mm off centre vs 70% coma free is a big difference.
I read some theory on one of the optics sites talking about aberrations close to the centre axis but i assumed that it would still be tolerable much further out than that. That would kind of imply that a 10" F4 is pretty well useless without a corrector which makes you wonder if the product is really fit for sale - rather than advertise "coma corrector recommended" advertising should read "coma corrector mandatory" - in which case why isn't it built in ?
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