I am keen to try Mono IR film initially on 6x12 roll film back on my Ebony RSW (therefore no focus scale), before I try to source 5x4 sheet. I am not sure how to compensate for the focus shift once I've correctly set-up the shot in the normal way on GG. I normally take an SQA with me so might be able to use the focussing on this in some way.
I shoot landscapes using 120mm and 90mm lenses and generally am looking for full front to back sharpness.
I can't recall seeing any mention of this in the books I've read, but am prepared to buy books if necessary.
Also in UK we are awaiting this years batch of Konica IR, are there any other films in 120 (and 5x4) which I ought to consider.