Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 238)

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Noise Reduction Settings
Long Exposure Noise Reduction
For images exposed for 1 sec. or longer, noise (dots of light and banding)
typical of long exposures can be reduced.
1 Select [ z : Long exp. noise
reduction].
2 Set a reduction option.
 [AUTO] Auto
For exposures of 1 sec. or longer, noise reduction is performed
automatically if noise typical of long exposures is detected. This [Auto]
setting is eff ective enough in most cases.
 [ON] Enable
Noise reduction is performed for all exposures of 1 sec. or longer. The
[Enable] setting may reduce noise that cannot be detected with the [Auto]
setting.
o With [Auto] or [Enable] set, the noise reduction process after the picture is
taken may take the same amount of time as that for the exposure.
o Images may look grainier with the [Enable] setting than with the [Disable] or
[Auto] setting.
o
With [Enable] set, noise reduction processing (indicated by “ buSY ” display)
when you shoot long exposures during Live View display will pause Live View
display, and you cannot shoot again until processing is fi nished.