Zacuto GH3 Z-Finder Pro Optical Viewfinder for Panasonic GH3 & GH4 DSLR Cameras, 2.5x Magnification, Built-In Diopter Optical viewfinder for GH3 camera with a form factor designed to enable clear, stable video shooting 40mm diameter lens provides 2.5x magnification of the camera's LCD screen Built-in diopter Includes Z-Finder Mounting Frame for GH3 and Gorilla Plate V2 that attach to camera via tripod mount. Gorilla Plate includes a 15mm rod port and the Mounting Frame provides rubber seal to protect LCD and fit snugly to camera back