The Lens Hood LH2-01 specifically for the SIGMA dp2 Merrill digital camera.
The Lens Hood deflects stray light from entering the lens, and protects it from bumps.
* All figures calculated by L-Mount. Note: The L-Mount Trademark is a registered Trademark of Leica Camera AG. About Product Name: Product name includes "DG" when the lens is designed to deliver the ultimate in performance on cameras with full-frame sensors, and "DN" when the lens design is optimized for mirrorless cameras with the short flange focal length.