Canon EOS 90D Advanced User's Manual page 92

Panning
 Set the level of background motion blur.
With [Eff ect], you can set the level of background motion blur. The [Max]
setting will set a slower shutter speed to increase the background motion
blur around the subject. If the subject blur is noticeable, set [Eff ect] to
[Med] or [Min] to reduce the blur.
Shoot continuously.

By default, < i > (Continuous shooting) is set. At the decisive moment,
press the shutter button completely to take the picture. You can track
moving subjects by panning the camera as you keep holding down the
shutter button to shoot continuously.
To see which lenses support the < r > mode, refer to the Canon website.
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With lenses that support < r > mode, the camera automatically corrects
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subject blur and (based on the [Eff ect] setting) adjusts shutter speed,
regardless of the lens IS setting.
The AF Area selection mode's default setting is Zone AF with the center of the
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screen selected.
The AF method can only be set to [1-point AF] or [Zone AF]. By default, it is
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set to [Zone AF], with the zone in the center of the screen selected.
To prevent camera shake, it is recommended that you hold the camera with
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both hands, tighten your arms close to your body, and track the subject's
movement smoothly to take pictures.
This eff ect is most eff ective with trains, cars, etc. that move at a constant
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speed in one direction.
Taking test shots or checking the image by playing it back immediately after
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shooting is recommended.
With telephoto lenses, be careful about camera shake and subject blur. To
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avoid camera shake, consider using a tripod or monopod.
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