The M-8 Perpendicular Plate allows you to attach your camera body to the Wimberley Head. You must have an Arca-swiss style plate on your camera body such as the P-5. The M-8 attaches to your camera body plate, providing a dovetail that is properly oriented to fit in the clamp of the Wimberley head.
With the M-8 attached, your camera body can be mounted on the Wimberley Head and you are ready for wide angle, scenic, or macro shots.
(Note: the Wimberley Head does not have a 3rd axis for adjusting the horizon, or for flipping the camera for vertical shots. You must level your tripod to ensure that your horizon is level, and vertical shots are only possible if you are using an L-bracket.)
This module allows you to attach the F-1 Telephoto Bracket or multiple F-2 Macro Brackets to your camera body.
It is also useful as a small macro slider for making small forward-backward adjustments for macro photography and for attaching a camera body, with small lens, to the Wimberley Head.