Adorama Budget Macro Focusing Rail Set with 4 Way, Fine Control, Camera Focusing Rail for Macro Photography. Two 6" rails allow the adjustment of the rail in all four directions: forward, backward, right or left. A rack and pinion gear system (for each of the rails) ensures smooth, precise and accurate movement of the rail. Locking knobs assure rock-steady focus once a shooting position has been attained. Compatible with most cameras, both film and digital, point & shoot and SLR.