The Zacuto Anti-Fog Protective Covers (Pack of 3) provide a replaceable anti-fogging layer on your Z-Finder Pro and V2 viewfinders, at the same time protecting them from scratching and other damage. An anti-fog coating is especially important when moving your camera between warm and cold environments.
Note: These covers are expendable as customers may lose, scratch or damage these covers over time. They are meant to give you anti-fog and to help protect the actual lens on the Z-Finder.
If your Z-Finder Pro and V2 did not ship with the anti-fog protective covers then you will need the Anti-Fog Protective Cover Upgrade Kit (pack of 3 with lens cap and eyecup) in order for them to work as the lens cap is slightly different than the one you have now.
More information about Zacuto Products (Link to Zacuto Website)