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Thanks for the interest Ken.
Catalin from CFF, advised that the advertised back focus was not fixed, but should have been within a certain range. The 132mm that I ordered was one of a run of 10 that had the tubes assembled first and then the objectives made to order (I had thought it would be the other way around).
A result of this was that my lens came up around F7 rather than F6.9 so increasing the back focus to around 200mm. I am not complaining - the scope is superb and I have made a number of repeat observations that I made once with my AP 130EDT over 20 years of ownership. I reckon this scope is better then the Astro-Physics.
To get around the longer back focus I have ordered a Baader 2" BBHS mirror diagonal rather than the smaller T2 prism. This will give plenty of leeway on the focus travel.
John
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