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I recall no FC issue with the XW 30mm at f/5 (no coma corrector) but that was at one star party long ago. It was a head-to-head with the T5 31mm and on that night I decided that the XW-30 was a clear winner and if I ever get a 30-ish mm premium widefield it will be that (never happened). The XW 20mm and 14mm are the only ones I recall as showing significant FC.
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Yeah, most coma correctors act as field flatteners also.
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