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The first 2 are on a 1940s 4x5 speedgraphic, with an old theater projection lens (roughly 145mm f2). The Speedgraphic works wonderful with this lens, since the speed has a shutter built in to the camera, and the lens has no shutter or aperture at all. although this camera could be hand held, I usually use it on a tripod, especially with lenses like this f2 lens that require critical focusing on the ground glass. Right now the lens is just mounted on cardboard, but a coworker of mine is going to CNC cut a nice board for me sometime soon

I have stripped off all the range-finder and other stuff that I don't need on the camera (though I left the top viewfinder) to try and save a bit of weight, and have less doo-dads sticking out of the camera to snag on things, hah!
The last 2 photos were shot on a 1950s Zeiss Ikon 6x9 folding camera (range finder), I don't know much about it. I usually hand-hold this one, like in the last photo with the self timer. It uses regular 120 film, I get about 8 or 9 shots per roll.
Here is a photo of the speedgraphic setup, before I stripped some of the parts off. I don't have a photo of the 6x9 folder: