I finally convinced myself I could accommodate the extra size and weight of an APM 30mm UFF to improve on the edge correction of my 31mm Aspheric or 30mm Paragon, but Don was out of stock. Then I was happy to discover Land Sea & Sky selling the Altair [assumed] equvalent for $4 less and free shipping, so I gave it a shot.
I haven't had a chance to get it out under the stars yet but a quick inspection revealed generally pretty good fit and finish on the outside, coatings look good, and the green is more subdued (darker and less glossy) than I expected from the pictures. The filter threads accept both of the 2" filters I own smoothly and completely. The filter threads are shiny, but that's true of some other eyepieces I have, and it doesn't seem to be a big deal in practice. But looking up the bottom of the barrel reveals an additional shiny ring on the inside that has me worried.
I'm not sure if this is a section of bare barrel, or some sort of internal spacer or stop that is not blackened on the bottom. It does seem like its somehwat conical and narrower at the top, but maybe that's an illusion due to the intervening lenses. I'm not about to disassemble the eyepiece for a closer look because I want the option to return it if need be.
Just holding the eyepiece up to the bright sky, it's not obvious that any light reflects off this ring into the field of view, but I'm hoping it will be clear enough to try out on the moon and bright stars just outside the FOV tonight. Maybe with sufficient baffling upstream this isn't the issue it might seem at first glance, but it's rather disappointing. Compared to this, the inside of my 31mm Aspheric is a black hole.
But then I looked this picture of an APM version (from https://www.cloudyni...-apm-30-mm-uff/) and while the ring isn't as shiny there, there's clearly some sort of brighter/more reflective internal element there too. I haven't read any complaints about it. Hmmm.