Zacuto’s Optical Viewfinders are large loupes that mount to the back of your HDSLR’s LCD, effectively letting you use your LCD as a viewfinder – a handy tool, indeed! And, with 3 versions available giving you correct form factor for video (the Pro 3x, Pro 2.5x and Jr.), you’ll have no problem finding the right one to suit.
Check out Philip Bloom’s review of the Z-Finder: Zacuto’s new DSLR Optical Viewfinder which allows DSLR cameras to have the correct form factor for video. “At the moment,” Bloom says, “there is nothing that comes close to this, it is absolutely essential for video on the 5dmkll. I couldn’t shoot handheld without it that’s for sure.” [source]