four notched prongs against the locating pin; the flange focal distance and diameter also differ. With the slow obsolescence of the Mitchell cameras, which likely took so long because they were so well regarded in mechanical design aspects, such as their steady intermittent movement registration ("Compensating Link" movement) and strong mounts, the mounts have gradually become less common in the past two decades, but remained an option for third party cameras produced as recently as the 1980s. Many of the cameras are still in usage in fields such as animation. Though the mount is not quite as common today, it is still very well regarded in the field. Technical specifications Flange focal distance: 61.468 mm Diameter: 68.00 mm Cameras: 35 mm Mitchell NC, Mitchell NCR, Mitchell BNC, Mitchell BNCR, Mitchell S35R, Arri 35BL3, Cinema Products XR35, Cinema Products CP35, Fries 435, IMAGE 300, Moviecam SuperAmerica, Moviecam Compact, PhotoSonics 4ER, PhotoSonics 4ML, Ultracam 65 mm Mitchell FC, Mitchell FCR, Mitchell BFC, Mitchell BFCR Lens mounts