As far as I know, 5x7 colour film is only available as special order from Kodak and OP stated they are interested in shooting slides.
Op has also mentioned that they want to shoot 1:2 ratio.
For me the obvious difference is that on a 4x5 camera OP would be able to achieve their desired 1:2 ratio on 120 film.
On the one hand, the much lower cost of 120 film, with many different emulsions available, no need to carry heavy film holders and the possibility to carry dozens of rolls in your bag without a significant weight increase… on the other hand a non standard format that OP would have to cut themselves from expensive 8x10 sheets and carry a bunch of heavy holders, a film charging tent… on top of an already much heavier camera and tripod…
For me the choice is a no brainer…. BUT I don’t print 8ft wide.
I shoot 612 format on 120 film, and I have an 8x10.
I wouldn’t be happy enlarging my 612 negs to 8ft wide.
But there’s no way I would carry my 8x10 to the places I can carry a 4x5.
So what about an in between solution :
OP gets a 4x5 with an extra 612 back… BUT they also make sure that their camera has at least 1.5inch of rear standard shift in each direction.
That way they can shoot a bunch of pictures on the cheap roll films, but when they encounter a scene that they know they have to capture large, they can use the rear shift to capture a 4x8*perspective on two sheets of 4x5.
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