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Canon EOS C300 Mark III (Locking EF-C)
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Canon EOS C300 Mark III (Locking EF-C)

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4 Day Rental Price:



*up to 2nd day air - overnight available

The Canon EOS C300 Mark III (Locking EF-C) is a cinema-quality camera with a Super 35 Dual Gain Output sensor that is capable of recording Canon Cinema RAW Light to dual CFexpress media slots. Key features include:

  • Super 35mm dual gain output CMOS sensor

  • Internal, 10-bit Canon RAW Light to dual CFexpress slots

  • Canon Log 2 and 3 Gammas

  • Locking EF mount with electronic contacts

Remember the C300 Mark II? The Canon EOS C300 Mark III is an update to the Canon C300 Mark II in name only. This camera is a close relative of the Canon EOS C500 Mark II; in fact, the C300 III’s body is identical to the C500 II. This means the C300 III is more modular than its predecessor, and that it can use all the accessories designed for the C500 II. There’s also anamorphic desqueeze support for 2x and 1.3x lenses.

Canon Super 35mm Dual Gain Output Sensor. This next-gen CMOS sensor provides 4K capture, but it also improves on many of its predecessor’s already great specs. It generates high dynamic range by combining images using pixels shot with a saturation-prioritizing amplifier for bright regions while using a lower-noise amplifier for darker areas. It’s capable of dynamic ranges beyond sixteen stops and is compatible with Canon’s Dual-Pixel CMOS Autofocus.

DIGIC DV7 Image Processor. The speedy DIGIC DV7 processor works in tandem with the imaging sensor to guarantee high frame-rate recording. This processor also powers the autofocus system, Cinema RAW light recording, HDR output, image stabilization, and proxy recording.

Dual-Pixel CMOS Autofocus. This autofocus system has phase-detection autofocus with two photodiodes at each pixel, offering greatly improved speed and accuracy. DAF can detect whether your subject is in focus, to which degree it’s in focus, and in which direction. You also get Touch AF and Face Detection modes.

Electronic Image Stabilization. The EOS C300 III includes the built-in five-axis image-stabilization system previously seen in the EOS C500 II. It works with just about any lens, including anamorphic lenses.

Canon Log 2 and 3 Gammas. Designed to take advantage of the C300 Mark III’s 10-bit recording capability, the files produced using Log format enable a large degree of color correction/grading in post-production with minimal image degradation. Canon Log 2 gives you the largest dynamic range and image details, and is most flexible in post, but it requires more time in color correction. Canon touts that it offers dynamic range up to sixteen stops. Canon Log 3 is an alternative that gives you a shorter turnaround time with an only marginally reduced, 14-stop dynamic range.

Canon Cinema RAW Light and XF-AVC Recording. The Canon Cinema RAW Light codec lets you internally record RAW and DCI 4K data to dual CFexpress cards via the dual CF express media slots. Cinema RAW Light’s 16-plus stop dynamic range gives you a lot of freedom for grading while producing files that are 1/3 to 1/5 times the size of Canon Cinema RAW, balancing image quality and codec efficiency. You also get the new XV-AVC codec that lets you record 4K and 2K images directly onto CFexpress cards. On top of the standard Intra-based XF-AVC codecs, a new lightweight Long GOP-based codec boasts a data rate that’s less than half of a conventional Intra codec.

Proxy Recording. The C300 III’s image processor allows it to simultaneously record 2K proxy files, which have a lower bandwidth that make them ideal for initial file sharing and rough cutting. While you’re recording Cinema RAW Light to an internal CFexpress card, you can also record an XF-AVC 2K 4:2:0 8-bit proxy to an internal SD card.

Canon Locking EF Lens Mount. This C300 Mark III features a locking EF mount, designed for heavier cinema lenses, and is compatible with all of Canon’s servo-zooms, EF Cinema, and EF lenses—over 100 lenses, including compact primes, super telephotos, specialty tilt-shifts, macros, and fisheyes. Please note that you’ll need to set the camera to a cropped sensor mode to use some cine and EF-S lenses.

Q & A

  • Do you offer this in different mounts?
    • Yes! In addition to the locking cinema EF mount, we also offer the C300 Mark III with a PL and standard EF mount.

  • Does this rental include a memory card?
    • We do not include a memory card with the camera by default but CFExpress cards and readers are available here as separate rental items.

  • Resources

  • Manual




    Camera Type




    • Type: CMOS
    • Size: 26.2 × 13.8 (4K), 24.6 × 13.8 (UHD)
    • Modes: Super 35mm, Super 16mm
    Effective Pixels
    • 8.85 MP (4096 × 2160; 2048 × 1080)
    • 8.29 MP (3840 × 2160; 1920 × 1080)
    Crop Factor
    • S35: 1.46x (4096 × 2160; 2048 × 1080), 1.534x (3840 × 2160; 1920 × 1080)
    • S16: 2.92x (2048 × 1080), 3.069x (1920 × 1080)



    Audio Inputs

    • 2x XLR 3-pin
    • MIC (3.5mm mini-jack)
    Audio Output
    • Headphone out (3.5mm mini-jack)
    Video Outputs
    • 12G/HD-SDI (BNC)
    • Monitor Out (BNC)
    • HDMI (Type A)
    Additional Inputs/Outputs
    • mini-B USB
    • Remote A (2.5mm sub-mini jack)
    • Canon Proprietary: Video Terminal, Grip Terminal, Expansion Unit Connector


    Item Type



    Canon EF


    Dimensions (WxHxD)

    • Camera Unit: 6.0 × 5.8 × 6.6 in.
    • Camera Unit: Approximately 3.8 lbs.
    Accessory Mounts:
    • Tripod: ¼”-20 & ⅜”-16 threaded holes
    • Additional: ¼”-20 threaded holes (camera bottom) (3x), ¼”-20 threaded holes (camera top) (8x)


    Power Supply


    • DC IN 12V jack (DC 11.5V–20V) (4-pin XLR)
    • Type: BP-A30 (available separately)/BP-A60 (included)




    • 2x CFexpress (Cinema Raw Light/XF-AVC)
    • 1x SDXC (XF-AVC)
    Video Formats
    • RAW: Cinema RAW Light
    • XF-AVC (MXF): Intraframe, XF-AVC Long GOP
    Audio Fomats
    • Linear PCM (24 bit – 48kHz; 4-channel recording)



    Canon EOS C300 Mark III (Locking EF-C)

    AC Adapter - Canon CA-CP200B Compact Power Adapter

    AC Adapter - Wooden 15v 10A XLR4

    Adapter - Canon CM-V1 Locking EF Mount (C500 II)

    Battery - Canon BP-A60

    Charger - 3 Prong Universal Power Cord 6ft

    Charger - Canon CG-A20

    Charger - Non-Polarized Cable

    Hardware - C200 Mic Mount Screws for Canon

    Hardware - Canon C Series

    Video Support - Canon GR-V1 Cable Lock (C200/ C500 II)

    Video Support - Canon GR-V1 Camera Grip (C200/ C500 II)

    Video Support - Canon HDU-2 Top Handle w/ Mt Base (C500 II)

    Video Support - Canon LA-V1/V2 Camera Arm (C200/500 II)

    Video Support - Canon LM-V2 4.3-inch LCD Monitor

    Video Support - Canon Mic Mount v2

    Video Support - Canon UN-5 Unit Cable

    Video Support - LA-V2 LCD Attachment Unit (C500 II) for Canon