Photographer and videographer Corey Rich has posted a behind-the-scenes video that chronicles the making of the Nikon D4 promotional video, "Why", which was the subject of an Adweek article that we noted in January.

The new 11-minute making-of video is called "How of Why". It includes interesting snippets of footage of some of the gear and techniques used to make "Why", which included a remote control helicopter, elaborate rigging setups, a triple redundant backup system, and a ton of Nikon cameras and lenses.

"How of Why" was also shot with Nikon cameras, including the D4, the D7000, and the P300.