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Focus cam will fit on 4x5 Linhof Technika III. The leading edge will need to be filed down to calibrate for a specific lens. Follow the tutorial at the link below to calibrate the cam. This cam is available marked for 150mm, 152mm and 6” to match the markings on your lens. Available in Aluminum or Bronze. Either will work fine. Bronze is stronger, but costs more.
Select: Small for 150mm Medium for 152mm Large for 6”