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ASA 2" .73 Back Focus for 12.5" f4.1 (1300mm) Native Newt

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Hello, I have a 12.5" f4.1 (1300mm) Native Newt that I am trying to setup my 8 year old ASA 2" .73 reducer corrector so it becomes a 12.5" f3 (950mm).  It will be used with a QHY268m camera who's diagonal measures 28.3 mm.

I believe that the right back focus is 65.5mm but I wanted to be sure and also see if there are any variances to get the best image quality.

Thanks in advance!


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