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I used one for many years. I don't think they are currently available from Lumicon.
If you're using, say, a 10" or 12" LX200 the "Eyeopener" adaptor gives an increase in FOV. The built in 3" compressor lens is OK but certainly not as good as a dedicated reducer like an Optec. If you can find one at a good price certainly a nice piece of gear. I replaced mine with the Celestron Radial.
BTW getting the guide camera in focus... usually needs either a 50mm spacer or better a cheap PRISM diagonal between the OAG and the guide camera.
As I mentioned before the Lumicon Newt OAG is good for 2" focusers and it has the same pick off prism adjustments as the GEG.
Hope this helps.
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