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Thanks everyone for commenting. I probably wouldn't use the Paracorr just for one eyepiece, but possibly for the XW14 XW20 and a couple of others too, all longer FL's. While I find the XW14 fine (very slight curvature), the XW20 performance is great in some scopes but in my smaller newts (FL = 900mm to 1000mm), field curvature is noticeable. In longer FL's it's not a big issue at all for me. From what you say, the Paracorr will noticeably improve things.
Having to disassemble would be a pain, so while I had thought of the MPCC, it looks seriously like the Paracorr is the best option,
Thanks again
CS
Nick
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