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Thanks for the analysis John. My guess is that TV eyepieces were developed first and foremost for their refractors, and so the slight +ve field curvature you have noted is deliberate to offset the -ve of the refractors. This would be particularly so for the shorter FL eyepieces, as they would be used much less with SCT's and large reflectors simply because the powers would be too high for most conditions.
Mind you, they are pretty good with reflectors too! I love my 13mm t6 Nagler with any scope that I have tried!
All the best,
Dean
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