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Hi Mark, I had both and they are both great eyepieces ! I found the 20mm Type II a tad sharper than the 27mm Pan from centre to edge of field . If memory serves me I think the 27mm Pan had better eyerelief,the 20mm Type II was a bit tight so If you wear classes while observing I don't think the Nag would be a good choice for you.
Anyway Mark both are great pieces of class and won't dissapoint you in sharpness across the field .
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