The tripod rotator allows the camera to rotate on top of the tripod without moving the tripod head. The lens axis should be as close as possible in both horizontal and vertical positions. To match your camera type with the correct TPR, compare the TPR number with the CR bracket number. The camera combination would be the same.
Tripod Rotator Bracket List:
DITPR100: Olympus E10, Canon D30 less battery base and film cameras like the Mamiya Pro with motor grip and 645AF, Pentax 645 and similar film cameras without external motors or winders.
DITPR200: Bronica ETRS, Si with speed grip or new small motor, Canon A2 35mm camera or other film cameras with 1/2" space between bottom of lens and bottom of camera
DITPR300: Digital cameras like the Fuji S1. NOTE: Do not use if you want to attach video or external battery cords to the front of the motor when using this bracket. If your camera has a vertical grip or motor that is 1" under the lens this is the bracket you need.
DITPR400: Nikon D1, D1X, D1H, F5, F100 with motor, Canon D30 with battery base, EOS1N with booster and similar film cameras with motors or winders.