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Just to add to Marks comment,
The other alternative was to modify (by shortening) the nose piece on the RGH.
By shortening (turning off) the end of the nose piece by a few mm, the same end result (achieve focus) was possible, but that would have meant the RGH nose piece was no longer standard.
This is because the RGH nose piece is longer than the 1.25"EP standard adapter and bottoms out at the base leaving bare RGH nose pice exposed at the top.
So for others in a similar situation but possibly without any further backfocus in their system, this may have been the only solution.
eg when using a FLI-PDF focusser.
Rally
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