Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 307
Red <, > internal temperature warning icon, Recording and image quality
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General Movie Recording Precautions Caution 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 < > icon will appear. The 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 < > icon is displayed varies depending on shooting conditions. Recording a movie at a high temperature for a prolonged period will cause the 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 < >, 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 < >. 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. 307