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I use a william optics binoviewer with 20mm eyepieces in a WO ZS II ED and a WO Megrez 110 ED.
They are great to use, your eyes don't feel strained as much and the view can be outstanding as you definitely get a 3D feel. In stereo your eyes seem to perceive more detail and its far more natural to have both eyes open.
A couple of point though:
1. You need a really rock solid mount as you have to squeeze down on the eye cups to hit the focus sweet spot with your eyes.
2. Some people's eyes just don't pull the two images together properly, I don't suffer from this.
3. Some people complain that the image is darker, this is correct theoretically as the light path is being split, but your mind working in stereo vision seems to work better, the upshot is to me the image is actually brighter.
4. They can take an initial set up to get them just right, that is you have to adjust and test the distance between each eyepiece and then focus each eyepiece individually to each eye - well woth it from my perspective.
5. Dont think you can just drop a 5mm eyepiece into these, they are suited to 15mm up because of various factors - unless of course you want to invest in a set of denks (US$2000!)
Yours in stereo...
Cheers, Alex.
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