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The reports of field curvature in the ES82D 14mm eyepiece didn't stop me buying one for my slower scopes. But in faster scopes I've read it can be a problem.
My 14mm ES82D is perfect in a f/12 Mak and good in a f/7 refractor. However, the other day I did solar observing with my ZS66 (f/5.9) and noticed that sunspots were in focus on one limb of the sun but very slightly out of focus on the other side. The difference was focused out with a very minor adjustment. Perhaps this is the FC of the eyepiece?
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