- The rubber eyecups don't fold down! Very annoying for eyeglass wearers. The shop owner recommended getting another set of rubber eyecups and cutting one down short.
- The 20x60 seemed to have a wider range of focus adjustment. It was the only one I could focus without glasses. (Sorry, I don't remember how many diopters my eyeglasses are.)
- The stock eyepieces on the 22x71 have very poor eye relief, much shorter than those of the other two models. And since I needed my glasses to focus, this pair turned out to be completely unusable for me. (Although the cut down rubber eyecups or optional wide-field eyepieces may remedy this situation.)
- The fluorite models are discontinued. (Not that I could afford it!)
I also tried the Vixen 30x125. I'm very impressed by the view. However the field of view looked even smaller than what the spec says (1.6 degree) - the moon took up almost half the field of view. I don't know if this is a bug or a feature, but I couldn't see the field stop - the edge of the field was fuzzy. Anyway this turned out to be a display model with no manufacturer's warranty, and with a piece missing (the Teflon bearing needed to attach it to an alt-az mount) so I'm no longer tempted to sell my best bike to buy this unit. I am, however, very tempted by the cosmetic blem Miyauchi 20x60 which they are offering for $420. (Yes, I know I just got a Mewlon, but... but... the Mewlon has a very narrow field of view, and I need a good pair of binocs to help with the star-hopping... Yeah that's it... )
Oh yeah, and the question part: the store owner said that the 20x77 has a lot more chromatic aberration than the 20x100 (non-fluorite), despite both being "semi-apo." Anyone know this is true?