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This is an extract from CN ... Credit to Stephan.
I can tell you about my binoviewing experience with two Docter UWA 12.5, but nothing about the Naglers (I don't have any Naglers). I recently purchased a pair Docter UWA 12.5 for my Baader Mark V binoviewer. Some positive remarks of our "Dr. Homma" (Tammy) encouraged me to purchase them.
First and most important, if you are interested in the Docters, a strong and rigid focuser is absolutely mandatory, able to support a 6 lbs. load without stress and able to hold that load in focus even with tube in full vertical position.
First the good things:
The first impression was very positive, these are quite heavy and decent looking eyepieces. And yes, the Docter UWA 12.5 pair work fine in bino action. I don't have any problems with merging both views and found the eye placement to the eyepieces very comfortable and relaxed. Due to the quite compact (55mm) body diameter of the UWA 12.5, there remains enough space for nearly everyones IPD and nose (my personal IPD is 62/63mm, and yes, I have a quite large nose). I fully agree with Tammy, these are outstandingly comfortable UW-eyepieces (84°) for binoviewing.
My first light test scenario for both UWA 12.5 was as following: Takahashi TOA-150B f/7.33 (with reinforced 4" standard focuser) -> Baader 2" ClickLock clamp for Tak -> Baader 2" nosepiece #16 -> Baader Fluorite Flatfield Converter (FFC) set at approx. 4.5x focal extension -> Baader T-2 1 1/4" Maxbright diagonal mirror -> Baader Mark V bino (without any glasspath corrector inserted) -> 2x Docter UWA 12.5. Resulting magnification of this combo is about 396x at f/33.
Test object was the Moon and first light with the UWA's 12.5 was simply breathtaking. They deliver a widefield image sharp over the entire field, with perfect detail definition and brutally hard contrast. Absolutely no false colors visible at moon limb, no matter if looking at the center or the outermost edge of view. The background perfectly deep black like velvet. I felt really impressed (or should I say shocked) by the UWA 12.5. There remains no doubt that the UWA 12.5 is an absolutely outstanding and very comfortable widefield eyepiece, perfectly harmonizing with a binoviewer, even when pushed to high powers. I wouldn't hesitate to recommend them to you, if your focuser supports such a load as previously stated.
I can see by this report that I may be up against a focuser issue ...my TV Genesis Focuser may not be enough to handle the ' weight ' of 2 x Docter and a Bino combination....I will have to see.
When it arrives, I will put my Bino on my Scope and place the Docter eyepiece into it ....make a judgement that way.
See what happens ......Col..
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