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I'll add to this, I think the MMOAG is a solution to a problem, but it has its strengths and weaknesses.
Its greatest benefit is that its wide and its takes up the least backfocus - it is almost the only OAG you can use with the older FSQ106's.
It uses the same sort of mounting system as many other OTA accessories (4 grub screws that screw into a groove on whatevere it adaptes to), but the problem is with a very heavy camera like the STL11000m and 8 filter wheel this mounting system is barely up to the job.
I can understand why they have done it that way - it allows any rotational positon to be attained which a simple screw on type fitting will not - ie once tightened it can end up anywhere !, but its less than ideal if you have a huge amount of weight hanging off it.
The method of setting the prism position is limiting and awkward, and necessarily involves a recollimation/realigning the prism each time, which means you have to remove the MMOAG off the OTA to do it.
Neither the helical focusser nor the fixed 1.25" adapter supplied can be used with a Remote Guide Head - they simply will not allow you to reach focus on the very systems it is supposed to be used with - that is sheer nonsense.
Also the helical focusser is OK (assuming you can reach backfocus) but it is sloppy in the helical threads from new - hardly something you want in a guide camera !
I couldnt use it anyway and ended up using a 1.25" EP compression fitting the same as Mark did.
Cheers
Rally
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