Just do some test when light box was delivered.
My simply set up incudes Hasselblad 907X 100c with Hasselblad 120mm and Otus 85mm. Camera was tripod mounted and light box was put against a wall. 8x10 film was put on light box with 3M magic tape on 4 sides.
This is 4x5 film scanned with the above set up. As Hasselblad 120mm covered 95% of the camera senor in 8x10 scanning, I am still thinking the setup for 4x5 film. Expect to test with Hasselblad 21mm extension tube which was ordered yesterday.
By the way, the Otus 85mm yields a much sharper image but it sacrifices too much senor pixels. Will the otus 100mm better?
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For rigging, Iād check out Novoflex bellows, lens and focusing racks they propose. Prices will add up nicely but should stay below the price of an Otus, which is not made for MF cameras.
Copying 10"x8" or 5"x4" film on to a 44mm x 33mm sensor falls within the comfort zone of a high quality enlarger lens which is actually designed for a flat field so I would also recommend looking into medium format bellows with a suitable enlarger or duplicating lens depending upon whether you also want to duplicate smaller formats such as 120 or 35mm.
Over on the Facebook forum āDigitizing film with a digital cameraā there are a lot of recommendations for lenses and setups for Fuji or Hasselblad 44mm x 33mm MF sensor cameras and they donāt tend to be OEM Macro lenses. A very good choice would seem to be the 80mm or 120mm Schneider-Kreuznach Makro-Symmar but there are other contendors. Just for 5"x4" or 10"x8" Iād think that an 80mm Componon-S enlarger lens would be excellent.
You really need some way of testing the results from your lenses, you can get a 5"x4" Transmissive target from here but you could also make up a reflective target from suitable bank notes to begin with.
Many thanks for your advice and information, Harry.
Do you have any idea to put a 80mm Componon-S enlarger lens to Hasselblad 907X or X2D camera?
Regards,
Yes, I think you would need the Novoflex bellows that Digitizer has linked though it might be possible to adapt other film era Hasselblad bellows, but you would then have a large choice of M39/L39 lenses to choose from. However I still think that you should try your own Hasselblad Makro-Planar lens but they were not necessarily designed with a flat field and corner to corner sharpness in mind. Some way of testing its performance and comparing it with others would be handy for that of course.
I might add that (from that other forum) some have then decided to use 65mm extension tubes with appropriate adapters and dispense with bellows altogether but you would need a separate combination for each format. Then of course you need to know how many extension tubes you need for each format! An M42 to M39 helicoid stage can be useful for fine tuning. Plenty of ideas on that FB forum though it can be hard to find them.
This excellent article by Mark D Segal is actually for a high MP Sony, but the same bellows I think:
This one I think, the BALPRO-1:
https://www.novoflex.de/en/products-637/macro/extension-bellows/universal-bellows-balpro-1.html
Just order the Balpro1 with Pyrite 4.5/90 and expect to test their arrival. Thanks Harry!
Wow, youāve been doing your research. I hadnāt come across that lens but I see that it was formerly known as the 90mm f4.5 Apo-Componon and that both Novoflex and Linhofstudio sell it for use with those bellows for duplicating film with sensors from Micro 4/3 to Medium format. You should have a great setup!
Just received Novoflex bellow and Pyrite 4.5/90 lens and conducted a simple trial. Color and sharpness are better than the result from Hasselblad lens and Otus lens. Pyrite lens easily covers 6x6, 6x9, 4x5 and 8x10 films. I found the best aperture of this lens is f16.
Now, I can turn my focus on wet mounting films and the set up of copy stand.
Thank you for advices and information in the forum.
im frustrated when reading someone says about scanning medium format negs with flatbedā¦ I have the v600, trust me I have been trying to scan this for like the last 4 years and every time I will go back to my digital camera scan 
It seems the color duller on the flatbed compared to digitalā¦ do I have to crank up saturation in NLP when converting?