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John,
The Moravian backfocus data is quoted as 'optical'. ie the cover glass is already accounted for, and you should not allow for it in the adapter calculation.
Regarding the +/- 1mm: at f/7 that sounds reasonable. Another factor (hopefully negligible!) that I did not mention before is that the optimum backfocus can also be affected by the deviation from flatness of the flattener!
Mark
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