Canon EOS 90D Advanced User's Manual page 603

Movie recording stops by itself.
If the card's writing speed is slow, movie recording may stop

automatically. For cards that can record movies, see = 617. To fi nd out
the card's writing speed, refer to the card manufacturer's website, etc.
If you shoot a movie for 29 min. 59 sec., the movie recording will stop

automatically.
The ISO speed cannot be set for movie recording.
In shooting modes other than < a >, the ISO speed is set automatically.

In the < a > mode, you can manually set the ISO speed ( = 280).
The manually set ISO speed changes when switching to movie
recording.
For viewfi nder shooting and Live View shooting, the ISO speed will be

set according to [ISO speed range] under [ z : z ISO speed settings]
( = 215). For movie recording, the ISO speed will be set according to
[ISO speed range] under [ z : k ISO speed settings] ( = 322).
Expanded ISO speeds cannot be selected for movie recording.
Check the [ISO speed range] setting under [ z : k ISO speed

settings].
Expanded ISO speeds are not available when [ z : Highlight tone

priority] is set to [Enable].
The exposure changes during movie recording.
If you change the shutter speed or aperture during movie recording, the

changes in the exposure may be recorded.
Shooting a few test movies is recommended if you intend to perform

zooming during movie recording. Zooming during movie recording may
result in recording of changes in exposure or mechanical sound of the
lens, or images may be out of focus.
Troubleshooting Guide
603