Ah! Something I can speak about without sounding like a gibbering fool. Seeing some spectacular 6x17 panoramas was the gateway drug that convinced me to go large format. Seeing the price on the Shen Hao 6x17 field cameras left me a bit speechless, so I looked in other directions, especially when I realized they can only do 120 film.
The short version is that in order to get the full 170mm spread, the Da Yi / Shen Hao film holders have to be set back from the usual focal plane (which is why they have their own ground glass holders, and are so much more expensive). As a result, 210mm lenses kind of work, but get cropped slightly on the ends. Anything between 90 and 200 is supposed to work-- I haven't been able to test this yet, apparently there's some kind of global crisis that's hammering international shipping.
Tony Santo has an in-depth video on the Da Yi back: https://www.youtube.com/watch?v=EScJzoWlMaQ (jump to 3:20 if impatient)
The backs run $600-800 USD.
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