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John & Tony, many thanks for your insight. It is more complicated, I see. I'm still coming to terms with the influence and relationship of focal length, the f/ratio, and diameter.
My question still remains, where can I find the necessary info about this property of eyepieces? This is such a significant element with such a range of telescope optics, to not have this information is such a let down to us, and a rip-off considering the surge of eyepieces with a FOV over 68 degrees. I now know it is a complicated thing, field curvature, but it's like the eyepiece producers/brands, don't want to admit that their gear has limitations in their suitablility. Hmmm.
Alex.
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