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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 210mm, 215mm, 8 1/4" and 8 1/2" to match the markings on your lens. Only available in Aluminum.
Select: Small for 210mm Medium for 215mm Large for 8 1/4" Extra large for 8 1/2"