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I have a couple of Pentax 6x7 lenses that I am currently using, a 75mm and a 300mm, both f:4. I'm about to get a Pentax 6x7 105 or 150mm for a bit better FOV. There are a lot of these lenses on eBay - .com more than .com.au, and are relatively cheap. Adapters are also available to fit them to many camera brands. I use mine with a QSI683ws and focus with a stock Robofocus motor/controller.
Charles
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