Canon EOS 80D - Manual (Page 212)

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You can shoot two to nine exposures to be merged into one image. With
Live View shooting (p.255), you can see in real time how the exposures
are merged when you shoot multiple-exposure images.
1
Select [Multiple exposure].
 Under the [z3] tab, select [Multiple
exposure], then press <0>.
2
Set [Multiple exposure].
 Select [Enable], then press <0>.
 To exit shooting multiple exposures,
select [Disable].
3
Set [Multi-expos ctrl].
 Select the desired multiple-exposure
control method, then press <0>.
 Additive
The exposure of each single image captured is added cumulatively.
Based on the [No. of exposures], set a negative exposure
compensation. Refer to the basic guide below to set the exposure
compensation amount.
Exposure Compensation Setting Guide for Multiple Exposures
Two exposures: -1 stop, three exposures: -1.5 stop, four exposures:
-2 stops
P
Multiple ExposuresN
The noise, irregular colors, banding, etc. of the image displayed during
shooting with [Additive] set may be different from the final multiple-
exposure image recorded.