The C300/500 Z-Finder is an optical viewfinder, specifically designed to attach to the Canon C300, C300 Mark II, and C500 cinema cameras LCD screen. This Z-Finder will magnify the LCD screen by 1.8x and has a diopter wheel for specific focus tuning. It cuts out any extraneous light and offers an initial point of stability by pressing your eye against the large eyecup. The Z-Finder includes 4 interchangeable anti-fog glass diopters, 0, +1, +2, and +3 so you can correct it to your vision right out of the box and then fine tune it with our red adjust wheel for perfect clarity. -1 and +4 diopters are available for purchase separately. An aluminum sun mask is built in to the Z-Finder to protect your LCD screen from sunlight. The C300/C500 Z-Finder is attaches by using a foam padded sleeve that slides over the LCD screen of the C300, C300 Mark II, or C500. The sleeve is secured into place with a bar clamp. It also includes a unique monitor lock clip to keep the LCD screen from moving forward when the Z-Finder is pressed against your eye. The Mounting Kit for the C300/C500 Z-Finder allows you to position the LCD screen forward and off the the side in a position to better enable shoulder mounted shooting. The Mounting Kit attaches to a Z-Rail mount and will allow forward/backward, side to side, and tilt adjustment of the Z-Finder. This mounting kit works with the C300/C500 Helmet and handle as a unified system. The C300/C500 Helmet Kit is required to use this kit. For the C300 Mark II, the C300 Mark II is required. When moving the LCD this far forward, you may need to get the Canon Extension cable- sold by Canon. The C300/C500 Z-Finder with Mounting Kit is only compatible with the Canon C300, C300 Mark II, and C500 cameras. It is not compatible with any other camera or set up.