Here from the internet is how you do it.
70mm to 120 film slitter
, on Flickr
And some results with F2.8 Rolleiflex:
[quote=DKimg;2729253]I've dabbled in some 70mm film and Kodak Vision3 film (65mm). Wanting to explore even further. Have purchased most of the equipment online throughout the couple of years (ebay) but haven't completely made it working yet. Nonetheless, here's a frame from Kodak Vision3 250D film, hand spooled. Shot on a Rolleiflex 2.8F