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C300 Firmware, Canon Tethering under Mavericks, and App Nap

Two-camera interview set up, Graham, TX. November 18, 2013.
Two-camera interview set up, Graham, TX. November 18, 2013.

The long awaited Canon C300 firmware update (allowing for user selection of the magnified focus area among other features) is now out. I have not had a chance to test it yet but you can get it here.

I also wanted to confirm that Mac OS 10.9 Mavericks works fine in terms of tethering the Canon 1D X. Tethering works in both Aperture 3.5.1 and Canon’s DPP v3.13.45.

A reminder, too, for all programs running in Mavericks where you need them to run in the background (e.g. FCP X, Aperture, DPP, Photoshop, etc.,) be sure to turn off “App Nap.” Go to File Menu > Get Info (command – I) and select “Prevent App Nap.”

Turning off "App Nap."
Turning off “App Nap.”

Updated 12/2/13 – Corrected C300 firmware number and link.

Update – 1/18/14: The video seen in the BTS shot above is now up – All for One and Supercuts for All.

Update – 3/17/14: My take on the firmware: Canon C300 News – Dual Pixel Coming and More (about mid-way through the post.)  Also, tied into the post above, I was having issues with Aperture and 10.9.1 on my Retina MacBook Pro when using the loupe. It would quickly crash Aperture. 10.9.2 has fixed that (most likely a memory leak of some sort.)


  1. Jon –

    AppNap turnoff is also important for folks using Capture One. Thanks for mentioning it.

  2. Mark Dobson

    Hi Jon,

    Just to say that since this firmware has been release it has already been superseded because of color balance issues in certain modes. Firmware Version is now available via the usual Canon website.

    I had a problem installing this firmware, don’t think I did anything wrong, and my camera has totally frozen up. I got a warning screen halfway through saying there was a problem with my CF card and then the recording light came on together with a light on one of the CF card bays. I eventually decided to power the camera down and it wouldn’t turn off. So ultimately I had to disconnect the power supply.

    The camera is now being repaired under warranty at my nearest Canon Pro repair centre in North London and hopefully I will get it back early this week.

    I’m pretty confident this was a local issue to me as I’ve not heard of anyone else having problems.

    But all these problems aside it is a useful update. The highlights for me are the moveable magnification area, being able to separately assign Iris or ISO control on the camera body and handgrip and the ability to hot swap lenses through an assignable button. ( running out of buttons! )

    The auto iris and focus is quite a novelty and actually works well with my 18-135 STM lens but I wouldn’t rely on it out on location. What is useful however is having the exposure bar on the screen and in the viewfinder.

    Love your filming set-up by the way.

    • Mark,

      Thanks for the correction! I meant to link to the newest one which was released on November 28th not the one from the 12th. Canon USA has an internal firmware page for all of their pro equipment which hasn’t been updated yet. Threw me off!

      Sorry to hear about your snafu. I trust they’ll get that sorted out quickly. I haven’t heard of any other cameras freezing. Maybe yours was because you did the update from the 12th (the one that was quickly withdrawn, for those reading)?

      I agree on the new firmware highlights – moveable focus magnification area being the biggest for me.

      How is the 18-135 STM lens? A better option than the 17-55 EF-S? I have neither. I use the 16-35 and the 24-105 or the 24-70. The variable speed (f/3.5-f/5.6) isn’t an issue?

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