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Focus cam will fit on 4x5 Linhof Technika IV, V and Master models. 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 240mm, 250mm and 10" to match the markings on your lens. Only available in Aluminum.
Select: Small for 240mm Medium for 250mm Large for 10"