HD cams come in many flavors, recording anywhere from 720P resolution to as high as 1080P, using anything from a standard definition sensor with interpolation to a true 1920 x 1080 pixel sensor. In the very highest quality HD cams, the RGB signal is not subsampled, offering the best HD quality at 4:4:4 (HDCAM SR). Typically, the chroma is subsampled at 4:2:2 RGB (DVCPRO HD) and 4:2:0 (HDV). Effectively, where HD leaves off, the RED One begins, offering 2K, 3K and 4K recording options. RED uses a sensor measured at 4520 x 2540 pixels, more than 4 times the number of pixels of the very best HD cam and records the signal as a RAW input, similar to a DSLR, with no color subsampling. All information travels in a single channel, as opposed to three separate RGB channels. Where a video camera requires the setting of white balance, color and gain before recording, these are all adjustments that can be made to a RAW recording after the fact, thus making the process of capture all the easier. The greatest benefit to the cinematographer is the fact that the sensor on a RED One is Super 35 sized at 24.4mm x 13.7mm, offering 35mm Depth of Field.”