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Message: <blockquote data-quote="mayoayo" data-source="post: 3282749" data-attributes="member: 16781">The ED50 is hard to beat for apparent sharpnes,but the TSN3 would be brighter at the same magnification ,just because its larger,...i tested the 12 mm BST explorer on the Kowa and on the ED50 and it  looked brighter on the ED50 at 23x than on the Kowa at 37x ,even with a sligh advantage in exit pupil size in the kowa ..comparing costrast in both scopes at similar exit pupil size looked always better in the nikon ..this gave the edge in apparent sharpnes to the ED50 ...but the kowa at 23x is brighter than the nikon and it resolves more detail at all magnifications..So you found a kowa / nikon adapter like the ones i made?,on Ebay?...You have a picture,?..i wonder if it could be one  of the few i made..for what is worth nikon eyepieces did a great job on the kowa,but the BST explorer is not very far behind</blockquote>