Canon EOS 90D Advanced User's Manual page 254

HDR (High Dynamic Range) Shooting
When shooting HDR images with [Auto Image Align] set to [Enable], AF
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point display information ( = 392) and Dust Delete Data ( = 241) will not be
appended to the image.
If you perform handheld HDR shooting with [Auto Image Align] set to
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[Enable], image periphery will be slightly trimmed and resolution will be slightly
lowered. Also, if the images cannot be aligned properly due to camera shake,
etc., auto image alignment may not take eff ect. Note that when shooting with
excessively bright (or dark) exposure settings, auto image alignment may not
work properly.
If you perform handheld HDR shooting with [Auto Image Align] set to
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[Disable], the three images may not be properly aligned and the HDR eff ect
may be reduced. Using a tripod is recommended.
Auto image alignment may not function properly with repetitive patterns (lattice,
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stripes, etc.) or fl at, single-tone images.
The color gradation of the sky or white walls may not be reproduced correctly.
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Irregular colors, irregular exposure or noise may appear.
HDR shooting under fl uorescent or LED lighting may result in unnatural color
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reproduction of the illuminated areas.
With HDR shooting, the images will be merged, then saved to the card, so
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it may take some time. During the processing of the images, "buSY" will
be displayed in the viewfi nder and on the LCD panel, and you cannot take
another picture until the processing is complete.
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