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The 18mm and 4.7mm reputedly have tighter eye relief than the others and there are reports of some reflections in the 4.7 and 8.8.
I have the 30, 11 and 6.7 and the only complaint I can make is relatively short eye relief on the 11 & 6.7 (similar to type 6 Naglers). The 30mm is an excellent eyepiece in all respects, with on axis contast and sharpness similar to a 31mm Nagler and good edge performance in fast scopes. The 24mm gets very good reports.
I directly compared a 40mm ES with a 41mm Panoptic - on axis was identical with the Panoptic having better correction in the outer field.
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