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I'm not sure if the 44mm they quote for canon sensor distance is to the glass on the sensor or to the sensor silica itself and that glass is normall 1.5 to 2mm thick. I'm sure the real tak adapters would put the distance spot on. But the 56mm will be to the canon sensor so the adapters should be 12mm plus the flattener thread depth I guess.
I think my distances are out by a little as I'm using adapters off ebay to cobble my filter wheel to the flattener. I think it shows up here as my normally parfocal filters not being parfocal, they are all slightly out. L&R&B are very very close but not exact while G definately needs refocusing and being around F4 the focus point is very narrow.
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