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This Mini-Clamp Package from Really Right Stuff includes the Arca-type compatible top B2-FAB screw-knob style quick release clamp with 1/4"-20 hole and the bottom B2-mAS screw-knob style quick release clamp. These clamps are mounted back to back, and the bottom clamp mounts onto camera bars, multipurpose rails, or nodal slides. The top clamp accepts lens plates, lens replacement feet, and camera plates.
Furthermore, this Mini-Clamp Package, used in conjunction with a multipurpose rail, allows a more precise focusing with your camera for macro photography. The package can also work with a camera bar and be used as a nodal point slider for panoramic shots. Both clamps can be set up to be parallel or perpendicular, which allows fore-aft or side-to-side motion.
The B2-FAB Clamp is made from CNC machined 6061-T6 aluminum, and it has an anodized Type II black finish. Index marks are laser-engraved on both sides of the clamp so a position can be repeated.