The aluminum alloy SmallRig Bottom Plate attaches to the underside of the Sigma fp camera via a 1/4"-20 threaded mount using the built-in flat head screwdriver, which stores under the bottom plate. On top of the plate next to the threaded mount is an anti-twist locating pin that prevents the camera from moving while mounted to the plate. The bottom plate also maintains access to the battery door in case you need to swap batteries quickly. With the plate equipped with four 1/4"-20 accessory sockets and several M3 and M4 sockets, the plate is prepared to accept compatible attachment accessories. The plate is compatible with the Sigma LVF-11 LCD Viewfinder, the Lens Adapter Support BSA2650, the SmallRig top plate for other accessories, and Manfrotto or Arca-type plates for quick release functionality.