Mitch Gross
Veteran
ARRI ALEXA sensor is 2880x1620, which can be pulled completely from the ARRIRAW file, which is an Uncompressed RAW. RED shoots in 4K REDCODE RAW, which is a selectable-compression RAW file. The resolution on the RED is also selectable, although it is generally a 4K compared to ALEXA's 3K. FS100 & F3 shoot at about 2.25K, but this is super-sampled within the camera for the 1920x1080 HD output.