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Flatteners and reducers have a specified metal back distance to work properly.
Metal back distance is the distance from the camera chip to the last edge of the metal frame of the reducer or flattener. It is something designed by the optical designer and is specified for that particular item.
So you have to find out what that distance is so you can get adapters set to make sure the flattener is that far away from the front surface of the imaging chip.
Unfortunately its not the same with various brands so if you have a few you end up with several adapters to match.
Greg.
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