Canon EOS 90D Advanced User's Manual page 154

Using the Self-Timer
With < q >, the shooting interval may become longer under some shooting
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conditions, depending on image quality, use of fl ash, and other factors.
If you will not look through the viewfi nder when pressing the shutter button,
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attach the eyepiece cover ( = 157). Light that enters the viewfi nder may
prevent suitable exposure.
< k > enables you to shoot without touching the camera mounted on a
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tripod. This prevents camera shake if you shoot still-life or long exposures.
After taking self-timer shots, playing back the image ( = 332) to check focus
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and exposure is recommended.
When using the self-timer to shoot yourself, use focus lock ( = 80) on an
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object at the same distance as where you will stand.
To cancel the self-timer after it starts, either tap the screen or press the < 0 >
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or < R > button.
If remote control shooting is enabled, the auto power off will take eff ect in
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approx. 2 min. even if [ 5 : Auto power off ] is set to 1 min. or slower.
If [ z : Bulb timer] is set to [Enable], < q > ([Self-timer:Continuous])
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cannot be selected.
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