So. I want to build a wide angle camera based on an RB67 back. I've seen pinhole wideangle cameras based on the RB67 back, so that's kind of the design aesthetic I'm going for (flat), but I want a glass lens. My basic criteria are: -Wide-ish lens, quality unimportant (low budget and I want somewhat lo-fi) -Variable shutter -Variable aperture -Coverage for 6x7 That's it. I was thinking I could source a shuttered lens off an old rollfilm folder, but the widest one I've seen is 75mm, and they all require long bellows for focus. Can I use a lens intended for a smaller format? Can I just mount some other lens in an old leaf shutter?