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Hi Matt
I don't think the hole at the end of the 9 1/4 is a full 2" (50.8mm), but I believe that this should not be a problem for 2" eyepieces with focal lengths of less that say, 35mm? That is, no vignetting effect. However, I'm guessing here so maybe someone who knows more definitely can chip in?
Yes - it's a simple tube with a couple of grub screws. I understand Lumicon offer a similar adapter but with the internal copper ring and a grub screw instead.
Cheers
Dennis
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