More than just a camera, the Canon EOS C300 and Canon EOS C300 PL cameras mark the beginning of a whole new system for the motion picture industry. 
The spec's of the Canon EOS C300 are very interesting for both good and bad reasons. Firstly it is available in either the cinema standard PL lens mount form or a Canon EF lens mount form. Canon have announced a number of 4K-capable cinema-specific lenses :
  • 14.5 - 60mm T2.6 wide zoom in both mounts
  • 30 - 300mm T2.95-3.7 long zoom in both mounts
EF-mount-only 24, 50 and 85mm cinema primes (which presumably will work great on AP-C sized Canon still cameras)
The Canon EOS C300 camera's sensor is a Super-35 sized CMOS of 3840 x 2160 pixels, which is actually Quad HD rather than cinema 4K but so be it. The bad news is that the camera only records 1080P at 24 - 30fps. onto its dual Compact Flash cards. That's right, there is no 4K output. The advantage of down-sampling is of course superior color, superior low-light performance, and the requisite shallow depth-of-field effects. In fact the sensor seems to be rather unique in the way that each color (RGB) plus luminance gets its own set of photosites. So 4K output would not be an option anyway.

  • Effective Pixels: 3840 x 2160 pixels; Approx. 8.29 megapixels
  • Total Pixels: 4206 x 2340 pixels; Approx. 9.84 megapixels
  • Sensor Type: CMOS (single-panel), equivalent to Super 35mm
  • Sensor Size: 24.6 x 13.8 mm effective screen size (6.4 x 6.4 μm pixel pitch)
  • Scanning System: Progressive
  • Number of Sensors: 1
  • Filter: RGB Primary Color Filter (Bayer Array)
  • Imaging Processor: DIGIC DV III
  • Signal System: NTSC and PAL
  • Compression: 8 Bit MPEG-2 Long GOP
  • Color Space: 4:2:2 at 50Mbps recording
  • Maximum Bit Rate: 50Mbps (CBR)
  • Canon Log Gamma: Available
  • Exposure Modes: Manual
  • Manual Gain: Normal Setting -6dB to 30dB
  • ISO: 320 to 20000
  • Shutter Modes: OFF; Speed; Angle; Slow Shutter; Clear Scan
  • Interchangeable Lens System: Choice of PL or EF mount camera
  • bodies for compatibility with a wide variety of lens systems.
  • ND Filter: Mechanical ND filter system with option of clear, 2 stops,
  • 4 stops, and 6 stops
  • Iris Ring: Iris Dial located on camera body for use with EOS EF Lenses
  • with electronic Iris control
  • Peripheral Illumination Correction: Available on EOS C300 (EF Mount only)