If you're not familiar with the VF-4, above is a short video review of the Carry Speed VF-4 LCD Video ViewFinder from YouTube member Blunty3000.
Here's another video of the VF-4 in use as part of a mini-rig setup on a GH3 camera from Johnny Gadget Films. [Note: the VF-4 is not designed to work with the GH3 camera perfectly. There is a millimeter of space that appears under the LCD].
Currently, the original discount promotion is back for a limited time and you can save $50 Dollars OFF on the latest Carry Speed VF-4 LCD Video View Finder for DSLR cameras.
$50 OFF VF-4 LCD View Finder for DSLR Video