Canon EOS-1D Mark IV - Manual (Page 154)

Camera’s internal temperature increase and image degradation
• When you shoot movies at high ISO speeds, noise (horizontal banding,
dots of light, etc.) or irregular colors may appear.
• If you continue to shoot movies for a prolonged period, the camera’s
internal temperature will increase. This can degrade the image quality.
While not shooting, turn off the power,
• If you shoot under direct sunlight or high-temperature conditions, the
<H> icon (high internal temperature warning) may appear on the
screen. If you keep shooting a movie with the warning icon displayed, the
image quality might degrade. You should turn off the power and allow the
camera to rest for a while.
• If the <0> icon is displayed and you keep shooting movies until the
camera's internal temperature increases further, the movie shooting will
stop automatically. Movie shooting will be disabled until the camera’s
internal temperature decreases.
Playback and TV connection
• If the brightness changes greatly during movie shooting, that part might
look momentarily still when you playback the movie.
• If the camera is connected to a TV set with an HDMI cable (p.171),
pressing the <INFO.> button during movie shooting will not display the
INFO screen.
• If you connect the camera to a TV set (p. 170-171 ) and shoot a movie,
the TV will not output any sound during the shooting. However, the
sound will be properly recorded.
^ Movie Shooting Cautions
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