You won't be able to get to the 8000ppi limit with those film holders if they are two 35mm frames side by side. In order to get the maximum, the center of the scan-able area is the only area utilized. It has to do with the way the lens and sensor are configured, it's more like an enlarger. See page 19 of the manual. The scanner can only get to the max ppi of 120 film as the two 35mm frames side by side give you a total width much greater that a 35mm frame in portrait orientation.
http://hasselbladrepair.com/wp-conte..._Userguide.pdf
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