The GH3/GH4 Z-Finder Pro is an optical viewfinder that allows the Panasonic GH3 or GH4 DSLR camera to have the correct form factor for video. This Z-finder will magnify the LCD screen by 2.5x and has a diopter for specific focus tuning. It cuts out any extraneous light and offers an initial point of stability by pressing your eye against our comfy, large eyecup. The GH3/GH4 Z-finder Pro comes with a 40mm diameter Zacuto optical designed lens, anti-fog coated protective covers, and all necessary additional accessories for the Panasonic GH3. The diopter allows you to dial in the focus to match your eye. If you need extra focal points you can use the included Z-Finder Extender Frames. These are semi-permanent stackable frames that attach to the body of the Z-Finder Pro and extend the Z-Finder glass further away from the LCD screen for people who are farsighted. The GH3/GH4 Z-Finder Pro attaches to your Panasonic GH3 or Panasonic GH4 with the included Gorilla Plate V2 and Z-Finder Mounting Frame for the GH3/GH4. The Z-Finder Mounting Frame for the Panasonic GH3/GH4 camera is specifically designed for a Panasonic GH3 and the Panasonic GH4 and is not compatible with any other cameras or alternate set ups. It will not work when a battery grip is added to the camera or when the camera screen is articulated. The included mounting frame is not compatible with the YAGH Interface Unit. The Z-Finder frame attaches to the DSLR Gorilla Plate V2 with two red Z-Finder Thumbscrews which screw directly into the Gorilla Plate V2. The frame has a rubber coating on the back to avoid scratching and to ensure a clean seal with the LCD screen. The Gorilla Plate V2 is a small platform baseplate designed for DSLRs and other small cameras. The Gorilla plate attaches to your camera using a standard ¼ 20 screw. You can mount your tripod plate underneath the Gorilla plate to quickly move from handheld to tripod use. There is a 15mm rod port on the underside of the Gorilla Plate V2 controlled by a Zacuto quick release ratcheting lever. The GH3/GH4 Z-Finder Pro Includes: Z-Finder Pro eyepiece/loupe with 2.5x magnification and diopter Three (3) Extender Frames Gorilla Plate V2 and Mounting Frame for the Panasonic GH3/GH4 Lanyard and Lanyard Hook Lens Cap, Sun Mask, and protective boot Z-Finder Dust Cover One installed and one additional Anti-Fog disc. This also acts as a lens protector and is expendable.