Not sure, but the widest medium format lens that I was aware of previously was the Bronica 40mm f4. This lens is f4, and Pentax had previously made a 45-85mm f4.5 zoom for the 645N. So I'm guessing something in the 30-35mm range for the digital 645 format (since it doesn't have to cover a full 6x6). No idea what the knob's for.
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