Canon EOS 90D Advanced User's Manual page 270

General Still Photo Shooting Cautions
Images and Display
Under low- or bright-light conditions, the displayed image may not refl ect the
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brightness of the captured image.
Under low light, noise may be noticeable in image display even at low ISO
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speeds, but there will be less noise in your shots, because image quality
varies between display and captured images.
The screen or exposure value may fl icker if the light source (lighting) changes.
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In this case, stop shooting temporarily and resume under the light source you
will use.
Pointing the camera at diff erent direction may momentarily prevent correct
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display of brightness. Wait until the brightness level stabilizes before shooting.
If there is a very bright light source in the image, the bright area may appear
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black on the screen. However, the actual captured image will correctly show
the bright area.
In low light, if you set the [ 5 : Disp. brightness] to a bright setting, noise
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or irregular colors may appear in the image. However, the noise or irregular
colors will not be recorded in the captured image.
When you magnify the image, the image sharpness may look more
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pronounced than in the actual image.
Custom Functions
Some Custom Functions are not available (some settings have no eff ect).
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Lens and Flash
If the attached lens has an Image Stabilizer and you set the Image Stabilizer
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(IS) switch to < 1 >, the Image Stabilizer will operate at all times even if
you do not press the shutter button halfway. The Image Stabilizer consumes
battery power and may decrease the number of possible shots depending on
the shooting conditions. When the Image Stabilizer is not necessary, such as
when using a tripod, it is recommended that you set the IS switch to < 2 >.
With EF lenses, focus preset during shooting is only available when using
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(super) telephoto lenses equipped with this function released in and after the
second half of 2011.
FE lock is not available with the built-in fl ash. FE lock and modeling fl ash will
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not work if an external Speedlite is used.
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