General Precautions to Follow While Recording Movies on the EOS 1Dx Mark III.
Article ID: ART176393 | Date published: 02/03/2020 | Date last updated: 03/23/2020


Please follow these simple precautions when recording movies on the EOS 1Dx Mark III.


General Movie Recording Precautions

General Movie Recording Precautions


  • Red Temperature warning red internal temperature warning icon

  • If the camera's internal temperature increases due to prolonged movie recording or under a high ambient temperature, a red Temperature warning red icon will appear.
  • The red Temperature warning red icon indicates that movie recording will soon be terminated automatically. If this happens, you will not be able to shoot again until the camera's internal temperature decreases, so turn off the power and let the camera cool down a while. Note that the time until movie recording stops automatically when the red Temperature warning red icon is displayed varies depending on shooting conditions.
  • Recording a movie at a high temperature for a prolonged period will cause the red Temperature warning red icon to appear earlier. When you are not recording, always turn off the camera.
  • Recording and image quality

  • If the attached lens has an Image Stabilizer and you set the Image Stabilizer switch to ON, the Image Stabilizer will operate at all times even if you do not press the shutter button halfway. This will consume battery power, and it may reduce the total movie recording time. When the Image Stabilizer is not necessary, such as when using a tripod, it is recommended that you set the Image Stabilizer switch to OFF.
  • If the brightness changes as you record a movie with Program AE or shutter priority AE, the movie may appear to stop momentarily. In this case, record movies with manual exposure.
  • If there is a very bright light source in the image, the bright area may appear black on the screen. Movies are recorded almost exactly as they appear on the screen.
  • Image noise or irregular colors may occur when shooting at high ISO speeds, high temperatures, slow shutter speeds, or under low light. Movies are recorded essentially as they appear on the screen, except with Canon Log View Assist.
  • Video and audio quality of recorded movies may be worse on other devices, and playback may not be possible, even if the devices support the camera's recording formats.
  • If you use a card with a slow writing speed, an indicator may appear on the right of the screen during movie recording. The indicator shows how much data has not yet been written to the card (remaining capacity of the internal buffer memory), and it increases more quickly the slower the card is. If the indicator (1) becomes full, movie recording will stop automatically.

  • If the card has a fast writing speed, the indicator will not appear or the level (if displayed) will not increase much. First, record a few test movies to see if the card can write fast enough.
  • If the indicator shows that the card is full, and movie recording stops automatically, the sound near the end of the movie may not be recorded properly.
  • If the card's writing speed is slow (due to fragmentation) and the indicator appears, formatting the card may make the writing speed faster.
  • Audio restrictions

  • Note that the following restrictions apply with [Movie rec. size] compression set to IPB (Standard) or IPB (Light) or [Custom Functions7: Audio compression] set to [Enable].

    • Sound will not be recorded for approx. the last two frames.
    • When you play back movies in Windows, movie images and sound may become slightly out of synchronization.