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Hi Alex
You need to have 66 mm backfocus from the back of the flattener to the chip. As the chip is 46.5 mm you need 19.5 mm to meet the exact requirements for focus.
It can be challenging, I have spent a few weeks trying to get the exact distance on a 120 with a CCD and OAG and it is a tedious process but I think I have it right now.
Brian
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