Canon EOS Rebel SL1 18-55mm IS STM Lens Kit - Manual (Page 131)

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This function reduces the noise generated in the image. Although noise
reduction is applied at all ISO speeds, it is particularly effective at high
ISO speeds. At low ISO speeds, the noise in the darker parts of the
image (shadow areas) is further reduced. Change the setting to suit the
noise level.
1
Select [High ISO speed NR].
Under the [z3] tab, select [High ISO
speed NR], then press <0>.
2
Set the level.
Select the desired noise reduction
level, then press <0>.
X The setting screen closes and the
menu will reappear.
[M: Multi Shot Noise Reduction]
This applies noise reduction with higher image quality than [High].
For a single photo, four shots are taken continuously and aligned
and merged automatically into a single JPEG image.
3
Take the picture.
The image will be recorded with noise
reduction applied.
3
Setting Noise ReductionN
High ISO Speed Noise Reduction
With [High] or [Multi Shot Noise Reduction], the maximum burst for
continuous shooting will greatly decrease.
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