Roll film backs

[Mongo]

A couple of other reason to use roll film on a 4x5: emulsion availability; there are more films available in 120 than in 4x5. Also, shooting a smaller negative allows you to use more greater movements if your lens doesn't throw a huge image circle. (The standard "press camera" 135mm lens doesn't leave much room for movements on a 4x5, but with a 6x7 back you can use extreme movements with the same lens.)

MSchuler - Modern LF lenses (and some not-so-modern lenses as well) capture plenty of information on a 6x7 frame for enlargements up to 16x20. Perhaps more, but I've never tried. Tonalities will be smoother with 4x5, but for learning you could do a lot worse than the setup you've described. One other thing to consider if you don't want to get into tray development would be a print drum on a motorized base. There's a great article at largeformatphotography.info that describes the procedure. You can pick up the drums and bases on eBay at very reasonable prices.

[Jeremy]

3x4 black and white in film holders and then 120 color in a roll film holder.

Oddly enough, my roll film back for 3x4 has the pressure rollers in it--something I thought wasn't made....maybe it is a hack job.

[Mongo]

Oddly enough, my roll film back for 3x4 has the pressure rollers in it--something I thought wasn't made....maybe it is a hack job.

Apparently some were made with the rollers late in the production of the old style (pre-lever wind) backs. I have a 6x9 back that's knob wind but that has the rollers.