If you like the 10x25, Bushnell 'made' one of the aluminum prism case reverse style 6x25 micros, the "Broadfield" at 11 degrees (makes up for the too low power), even better, it is clearly stamped as an Ashai Pentax product. Mine doesn't fit my big hands but the size is hard to beat. They show up often enough to find and are easily cleaned.
I started picking up Hensoldt post war Dialyts when I realized they were essentially zeiss units.
16x56 AK Hensoldts were made through the 1950s into the 60s!
Essentially the later Zeiss binos but with single coatings. Arguably, the AK design and light paths do not require phase coatings, and, personally, I find this to be true, no resolution degradation is noticeable to me. Later modern coated Zeiss are better contrast etc, but the late 50s and 60s (I cannot find my production date tables, see Post 69 in the link below giving 1963) are still stunning. Pricing runs around 400 USD or euros last I saw, I assume 1/5 or less of a new or used late Zeiss.
Eyepieces are simpler but excellent, fov varies between models. I have different models at 50 and ones at 60 degrees. Abberations are excellent I think, field curvature sensitivity seems to depend on your age. If you use reading glasses you will notice it. Fewer elements helps the throughput though.
There is a discussion of the lack of need for phase coatings in AKs at https://www.birdforu...d.139957/page-4 and the Holger Merlitz link in the post.
On any 50s 60s Leitz or Zeiss, later seems better. I have identical 7x50 Marseptits made early and late 50s, with similar coatings but the later ones are far 'whiter'. Both are amazing though. Of couse avoid anything uncoated, although the AK designs were apparently part of an effort to reduce transmission losses.
Only buy totally clear ones, they are essentially impossible to disassemble without special methods (I've done 1 1/12, one prism still won't free up but I'll free it when I have time), since the slide in prism bodies and securing screws corrode together. Light haze on the front and rear prism faces can easily be cleaned (pure cotton or microfiber looped towelettes only, do NOT try optical wipes unless you are certain the coatings are hard and late enough to avoid sleeking). Haze free Hensoldts are astonishingly better than ones with seemingly light internal haze.
Edited by markb, 03 August 2021 - 09:48 AM.