Acratech Nodal Rail with Level Quick-Release Clamp, 25lbs Load CapacityThe Acratech Nodal Rail with Level Quick Release Clamp makes it possible for you to adjust your camera's position, front to back, to position the lens nodal point over the center of rotation for accurate stitched panoramic images. It has adjustable stops that can be preset to the nodal point of two different focal lengths. Easily holds over 25 lbs (11. 4 kg) Weighs less than 0. 5 lb (0. 2 kg) with the quick release clamp Indexable quick release clamp