Canon EOS 90D Advanced User's Manual page 604

Troubleshooting Guide
The image fl ickers or horizontal stripes appear during movie
recording.
Flickering, horizontal stripes (noise), or irregular exposures can be
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caused by fl uorescent lighting, LED lighting, or other light sources during
movie recording. Also, changes in the exposure (brightness) or color tone
may be recorded. In the < a > mode, a slow shutter speed may reduce
the problem. The problem may be more noticeable in time-lapse movie
recording.
The subject looks distorted during movie recording.
If you move the camera to the left or right (panning) or shoot a moving

subject, the image may look distorted.
I cannot take still photos during movie recording.
Still photos cannot be taken during movie recording. To take still photos,
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stop the movie recording and perform viewfi nder shooting or Live View
shooting.
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