The Novoflex QPL-Vertikal L-Shaped Quick Release Plate makes it easy to change the camera's orientation from landscape to portrait. It fits on the Q=Base quick release adapter, as well as on any Arca-type compatible quick release assembly. The plate also works with a power booster or vertical grip attached to the camera.
Compatibility
Bigger DSLR cameras such as Nikon D800/750, Canon EOS 5D Mark III, and similar 
Finely machined for Arca-type compatible quick release clamps 
Uses the special safety pin of the Q=Base to prevent the camera or other attached gear from accidentally slipping out from the quick-release