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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 178mm, 180mm, 7" to match the markings on your lens. Only available in Aluminum.
Select: Small for 178mm Medium for 180mm Large for 7"