Canon EOS 80D - Manual (Page 145)

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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. When shooting at low ISO speeds, the noise in the darker
parts of the image (shadow areas) can further be reduced.
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>.
 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.
If the image-recording quality is set to RAW or RAW+JPEG, you
cannot set [Multi Shot Noise Reduction].
3
Take the picture.
 The image will be recorded with noise
reduction applied.
3
Setting Noise ReductionN
High ISO Speed Noise Reduction
When Multi Shot Noise Reduction is set, you can display <z> in the
viewfinder.