Canon EOS Rebel T5i 18-55mm IS STM Lens Kit - Manual (Page 331)

331
Troubleshooting Guide
In shooting modes other than , the ISO speed is set
automatically. In the mode, you can freely set the ISO speed
(p.178).
If you change the shutter speed or aperture during movie shooting, the
changes in the exposure may be recorded.
Zooming the lens during movie shooting can cause changes in the
exposure regardless of whether the lens’ maximum aperture changes
or not. Changes in the exposure may be recorded as a result.
If you move the camera to the left or right quickly (high-speed panning)
or shoot a moving subject, the image may look distorted.
Flickering, horizontal stripes (noise), or irregular exposures can be
caused by fluorescent light, LED bulbs, or other light sources during
movie shooting. Also, changes in the exposure (brightness) or color
tone may also be recorded. In the mode, a slow shutter speed
may solve the problem.
The ISO speed cannot be set for movie shooting.
The exposure changes during movie shooting.
The subject looks distorted during movie shooting.
The image flickers or horizontal stripes appear during movie
shooting.
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