I'm currently researching a number of photographers and trying to tie them into to the existent optical technology of their time. Whilst this question has been asked before, I'm interested in what lenses were used for the early 1861ish mammoth images, as some of the lenses that I've seen attributed to Carleton Watkins use were almost certainly not available for his first trip into Yosemite. So what was he using to cover this large format? If anyone can help a source of the information would be really helpful. Thanks.
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