The Z-Finder Pro 3x is another one of Zacuto's Optical Viewfinders that allows DSLR cameras to have the correct form factor for video. It offers 3x focusable magnification (2.5x is available), a 40mm diameter Zacuto optical designed Anti-Fog lens, an eyecup preventing extraneous light leakage, a diopter and a field of view perfectly matched to 3" LCD screens.
The diopter allows you to dial in the focus to match your eye. If you need extra focal point you can use the Z-Finder Extender Frames. The Z-Finder Pro 3x has a diopter range of -2.75 and up (unlimited with extender frames). These are semi-permanently stackable frames that attach to the skirt of the Z-Finder Pro and extends the Z-Finder glass further way from the LCD screen for people who are farsighted.
The Z-Finder Pro uses Zacuto's Gorilla Baseplate and Z-Finder mounting frame to mount to the camera. The Gorilla Baseplate attaches to the bottom of your camera using a ¼ 20" screw and the Z-Finder mounting frame attaches to the Gorilla Baseplate using thumb screws. The rubber back mounting frame does not attach to your LCD; it is held in place against your LCD with pressure.
This method allows you to quickly remove the Z-Finder Pro by snapping it off the frame. If you want to remove the entire mounting frame from your camera, you can do so by loosening the thumb screws and pulling up on the metal mounting frame to release it. With the Z-Finder Pro, you are also a step closer to using one of Zacuto's Gorilla Support Rigs, as they use the same baseplate as the base.