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I'll provide a counterpoint to most of what Mark has said now, not to create an argument, but because my experience has been almost totally the opposite.
I have the MOAG, not the MMOAG, but both use a v-groove or dovetail adapter to connect to the filterwheel. I find that this is an excellent method to attach the camera to the OAG, it doesn't provide any flexure at all, the four grub screws ensure that. Yes, the inside of the V gets marked, but who cares? If you're really worried, get the plastic tipped grub screws. The nature of the V-groove means that as long as it's cut perpendicular to the main axis it'll hold the system square, as long as you tighten the grub screws properly. By this I mean just nip them up, then progressively tighten them until snug.
I have also found Don Goldman a pleasure to do business with, very helpful. I didn't have the focus issues Mark had mainly because I also have an AOL, so the setup is different.
I think it's a great product.
Cheers
Stuart
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