i created a great set up to scan my old 120 and 220 rolls of film.
I bought a decent Kaiser copystand, also found a great Bowens illumitran on the Bay and then used my P25 my Phamiya 120 Macro and my DF body... tethered to Lightroom.
A couple of points....
this is a quick and easy set up for volume work and the quality is more than adequate for cataloging, web and the odd print.
For real real real FAB images i get them drum scanned but for digitizing my old stuff to a very good standard this is quick.
you can create or find on the web a DNG profile to convert B&W negs to positives in LR.
Colour print film I never used much so what little I had got scanned
35mm negs and slides got scanned.
I've almost finished backing everything up so will soon sell the Kaiser/Bowens rig.
The benefits of this set up where...
Time....I can click a whole roll of 120 before the scanner would have warmed up.
Cost... A decent Imacon is still as much as a digital back
Flexibility.... My files are 16 bit MF raws... so they capture all that was there
Did I mention NO DUST...!