Reasonable upgrade=yes if you're looking for a more modular camera system. There won't be any effective difference in picture quality except the slightly wider negative
I am looking for something more modular. There have been many,many times with my Yashica that I wish I could have that extra little bit of width, mainly because of the 80mm lens. I just tend to use wide or telephoto and don't really find the middle ground (like 50mm in my Pentax SLR's) useful for me. I guess I see things different and tend to shoot wide or very closeup.
Would an RB67 Pro-s be a reasonable upgrade from using a TLR for landscape? 4x5 is out of the question at this point.
What is it specifically that makes you think you need to "upgrade" from a TLR? Do you need lens interchangability? Is it rectangular format instead of square? Except for 4x5, my best work has always been done on square format. My favorite has always been Yashica TLRs in particular, even though these days I own Mamiya C-220 and C-330 gear with several lenses. Quite honestly, I would like to sell all that gear as I only use my Mamiya 6 folder any more. IMHO,simplicity and light weight make for more enjoyable trips in the great outdoors.
To be honest I don't particularly like the 80mm lens on my Yashica. IQ is great, and I like square just fine, but the focal length just doesn't do it for me (see post #7).
I used to own an RZ67 outfit and sold it when I moved to large format. I had the 50mm ULD, 110mm and 180mm lenses. It all weighed a ton packed together. You could carry a used lightweight Cambo or Calumet 4x5 monorail with three lenses for less weight and equal or less money invested (compared to an RB) depending upon your lens selection. I sold my 50mmULD for $500.00.
For me, the main reason for 4x5 over 6x7 is camera movements with every lens.
I have thought seriously about a 4x5 with a rollback, but most of the ones I've seen you have to remove the GG to attach the rollback and that seems like a hassle. I'm not in a particularly rush to get anything done when I'm shooting and tend to take as much time as I need so I think LF would suit me at some point. I do really think that 4x5 deserves darkroom printing though and I just don't have the $$$ or place for one at the moment. Maybe in a few years.
Right now I can get a pretty decent RB67 rig for less than $500 with a body, two lenses, and two backs. My shooting isn't usually worthy of expensive glass, I've used some on my digital rigs and didn't notice a difference personally.
Mamiya 6x6TLR wides and a telephoto is portable, an RB67 kit needs four legged/4WD friend.
see post #20 about the weight I already carry when I'm out and about being particular about shooting. I'm not planning in hiking 10 miles through the mountains with it, but I can carry my pack as it is now all day long.