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Field curvature
I am so glad someone had raised the issue here.
In my 8" LX90 (F10 SCT) I have field curvature affecting any eyepiece above 10mm FL. Whilst meeting some great people at SPSP I got a chance of trying different eyepieces in my scope (I mean to say great eyepieces like Panoptics and Naglers) and they ALL showed field curvature. Thanks to Don from Bintel and the Iceinspace clan.
I tested them against Nagler 17mm and Uwan 28 I own and yes they show it too. I have also tried my eyepieces in someone else's LX90 - same problem.
I think I have reached the limit of my LX90 (price / performance limit that is).
I am told that the new RC scopes from Meade perform better but they are expensive...
RGDS Joe
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