What is an Arca-Swiss Quick Release System?
Swiss camera equipment maker Arca-Swiss Phototechnik AG independently developed a quick-release mounting system for their tripod heads. The system is based on 38 mm wide mounting plates with a 45° dovetail rail on the sides, which is clamped into place on the tripod head receiver with a screw-fastened grabber plate.
In addition to its use in photography, the Arca-type dovetail rail has also become popular in shooting competitions such as the Precision Rifle Series for attaching auxiliary equipment such as bipods, tripods, etc. An advantage of the ARCA rail over traditional firearm mounts (such as the Picatinny rail) is that the ARCA rail allows for stepless sliding adjustment.