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There is a small lens in the bottom of the 1.25" port of the MOAG. This is to extend the focal length to a similar distance to that of the STL, or in my case an ST-10 and CFW. When I insert the RGH I have to leave it a little bit proud (sticking out) of the helical focuser. If I remove the lens I may not have to do this. As an alternative there is another lens that can go in there that shortens the focal length. All the info is on the Astrodon website.
Greg, I'm not sure how the backfocus distance of the RGH differs from the ST402, do you have to go closer, or further away?
If closer then remove the lens at the bottom of the helical focuser. Further away, check that it's there first, then buy a 1.25" eyepiece extender.
Cheers
Stuart
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