The bottom rail includes compatible dovetail that works with clamps while the slider is equipped with quick release clamp. The clamp can be oriented in 4 positions using the center screw and dowel pins. Camera to subject distance can be adjusted in fine increments using Mitutoyo Micrometer Head with 0-25mm range and 0.001mm graduation. Micrometer head can be oriented in any direction (default orientation is with scale facing up.) Rail will work in 90 degree orientation (perpendicular to the ground) with load up to 10 lbs. When rail is in horizontal orientation (parallel to the ground) it can hold up to 15 lbs.