I've found it's sometimes easier to get super rare lenses because there is little knowledge of them so low demand. When everyone was chasing Pinkham and Smiths, I looked for other, more uncommon soft focus lenses. Same with Petzvals, when everyone chased Dallmeyers B models, I just found the others that were just as good. I suppose enough people need Ultra Long lenses that those do have demand, otherwise they would be quite cheap.
Quinn is great, he basically started the wetplate craze in Europe that we are now seeing grow and grow. Kind of like Coffer started it in America about 5 years before that. I helped Quinn one year shoot wetplate at a French photo fair. He was quite a wetplate celebrity and the booth we ran had a line of people wanting their plates made, all weekend.
It takes a while to get good results with wetplate, but it goes faster if you learn, hands on, from a pro. Too many hacks try to impress by "the old fashioned" nature without any real skill in technique or composition or lighting. I've seen a lot of very poor novice wetplater work over the years, where the vision of "doing it the old way" cannot save what are very bad plates.
With your LF background you are many steps ahead of the casual person who decides to start doing wetplate, and tries to learn by just reading a few facebook groups. I saw you were also going to start on small plates, that's always a good plan. I shot half plates every day or two for about 6 months when I was learning, and never went to large plates until I could get a good result on a 4x5 size. Remember, 98% of the old Ambrotypes and Tintypes were quarterplate (3 1/4 X 4 1/4) or smaller, in the 1870s. Even Brady and Gardner shot fairly small plates, smaller than 8x10. Yet their quality is seldom met today. You can shoot a hundred smaller plates with the same amount of chemistry that will be exhausted by 10 Mammoths.
Luther Gerlach is another collodion artist that has done mammoth plates for a long time. You might want to connect with him too. An example:
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