Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 274
K Movie Recording
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4K Movie Recording Recording 4K movies requires a stable card with a fast writing speed. For details, see Cards That Can Record Movies. 4K or High Frame Rate movie recording greatly increases the processing load, which may increase the internal camera temperature faster or higher than for regular movies. If a red icon appears during movie recording, the card may be hot, so stop recording the movie and let the camera cool down before removing the card. (Do not remove the card immediately.) From a 4K movie, you can select any frame to save to the card as a JPEG still image ( ). Caution AF is not used to focus when / or / is set. No AF points are displayed. Also note that the focus guide is not displayed, even with the lens's focus mode switch set to < >. 274