The Zacuto FS7 Z-Finder is specifically designed to suit the shape and size of the monitor included with the Sony FS7 and Sony FS7 II. The FS7 z-Finder comes with a flip up frame designed to clamp onto the FS7 & FS7 II LCD. The Zacuto Z-Finder will pop on and off the frame for quick shooting. The red lever at the bottom of the frame allows you to quickly flip the Z-Finder up without removing it from the frame. It can be flipped open to 140 degrees. If a producer/client/director etc. wants to see into the viewfinder, you can flip it open instead of having to adjust so they can get their eye to the loupe. You can also pop off the Z-Finder and use the FS7 LCD as a monitor. This Z-Finder model includes a newly designed sun mask to reduce the possibility of damage to your camera LCD screen. Zacuto has completely redesigned its optics system to include three glass diopters that can be used to alter the amount of optical correction needed depending on your eyesight. This state-of-the-art eyesight correction technology slides in front of the lens of your Z-Finder making it custom to your vision. The FS7 Z-Finder includes 4 diopters, 0, +1, +2, and +3 so you can correct it to your vision, right out of the box. Youll be able to purchase an additional -1, and/or +4 diopter if needed. The most important part of all Zacuto Z-Finders is our newly improved anti-fog formula that is coated on all of our new diopters. The 0 diopter gives you fog protection with no optical correction. It doesnt matter how good your optical viewfinder is, if it fogs, its game over. Its the single most important factor in making a viewfinder purchasing decision. You can take our patent pending fog protection formula from an air conditioned interior to the most humid exterior and its guaranteed not to fog. These fog filters diopters are really truly amazing! WARNING: The Z-finder is a magnifier and as such will magnify the sun which can damage the LCD screen if the sun is allowed to shine directly through the Z-finder lens. Use the enclosed lens cap to block light from entering your Z-finder when not in use. Using the Zacuto Z-Finder shortens the length of the overall FS7 viewfinder helping to achieve balance and comfort. Read directions to learn more.