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The last version of the lens mount is designed to position the lens so the axis of rotation matches nodal point of the lens. It can also be adjusted using one of the tilts on the tripod head to get it perfect. (ie put an object in front of the lens and adjust forward tilt until the position of reference object doesn't change in relation to background when camera is rotated from side to side) I get either "good" or "very good" in ptgui optimizer