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Tony
That 85mm is correct as you have to add 16mm for the internals of the flattener/reducer and that gets to the 101mm stated in the download. I'm sorry I stated 111mm whereas I should have stated 101mm. My mistake.
I found when I used it on my 10" SCT, 10" GSO RC and 5" refractor that it was perfect for all of them. Thus I'll have a few reducers to sell.
They say you can vary the distance but I have not experimented to that degree but I trust what they say. David Courtney has experimented to get to f5.5 or f5.4 with his GSO RC and the results were impressive.
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