Hello at all,
I have some questions upon what you wrote.
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It does exhibit field curvature in fast newtonians.
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If you use a paracorr it flattens the field nicely.
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The field curvature will be eliminated if you use a paracorr.
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1) What is field curvature?
2) does the field curvature of the XW 20 only appear in fast scopes?
3) does the paracorr eliminate field curvature? Is it a field flattener?
4) why does TeleVue tell that the paracorr works as a coma corrector,
not as a field flattener?
http://www.televue.com/engine/page.asp?ID=230
Regards, Karsten