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An update with the eyepieces I have at hand :
8" F4 - without coma corrector
24mm Panoptic - pretty acceptable if I focus stars 70% from centre - centre looks sharp enough and whole field looks fairly good. Much better than I expected .
16mm Nagler Type 5 - acceptably sharp at edge centre 50% very good
13nm Nagler Type 6 - improved sharpness at edge - overall very good .
I'm evaluating these optics for a binocular telescope where a coma corrector is technically too difficult . MY impression is that it is all certainly possible to live without a coma corrector for visual use with these high quality eyepieces .
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