Thanks! I read your book, but can't remember if you mentioned the post ed50 days, and I since passed the book to a friend. I'm guessing you switched to the stc or 554?Hey! this is thread is 4+ years old and I've since retired the NikonED when Swaro' and Kowa upped the game in the compact spotters, so my memory is a little foggy now.
I only had the factory 13-30 for this review so can't comment on the 27 or the 40x. Someone on here later sent me the other eyepieces to try but that was four years ago and all I remember is that I would have upgraded if that member would have sold one to me. Pretty sure it was the "wide angle" so must've been the 27?
Not much help but there are some other guys on this thread who might still be around to answer. If they don't, it might mean they're not subscribed to the thread, so if you see a post above from someone, try a PM (hover over his screename under his avatar).
Good luck