Lumicon OAG
Darrell,
I've got exactly the same model! Was used on my 18" f4.5 and now is "spare".
I found a 1.25" prism diagonal ( has to be prism to give you the compressed focal length) on the guide tube to be the way to go!
There's absolutely no light loss the the camera as the pick-off prism is well out of the light path to the CCD. The lumicon has quite a large pick-off prism and gives a good coverage.
If I can help with photos etc of my set-up just ask.
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