The 235mm Clamping Plate by Novaflex is an Arca-style compatible plate for panorama brackets. It is designed for larger lenses with a wide front seated nodal point. On the side of the plate are calibrated scales to precisely match your lens and camera combination with each use. A standard 1/4"-20 screw attaches the plate to most DSLR cameras. The plate allows you to align your nodal point with the axis of rotation, therefore keeping your foreground and background objects properly aligned and eliminating parallax errors.