Canon EOS 80D - Manual (Page 215)

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P Multiple ExposuresN
 During continuous shooting, the continuous shooting speed will
decrease greatly.
 Only the merged multiple-exposure image will be saved. The images
taken in steps 6 and 7 for the multiple-exposure image will not be saved.
 The image-recording quality, ISO speed, Picture Style, high ISO speed
noise reduction and color space, etc. set for the first single exposure will
also be set for the subsequent exposures.
 You cannot set an aspect ratio for multiple-exposure shooting. Images
will be taken with a 3:2 aspect ratio.
 If WB bracketing, Multi Shot Noise Reduction, HDR mode, or a Creative
filter is set, multiple-exposure shooting cannot be set.
 During multiple-exposure shooting, the settings of [z1: Lens
aberration correction], [z2: Auto Lighting Optimizer], and [z3:
Highlight tone priority] will be automatically switched to [Disable].
 If [z3: Picture Style] is set to [Auto], [Standard] will be applied for
shooting.
 With multiple exposures, the more exposures there are, the more
noticeable the noise, irregular colors, and banding will be. Also, as noise
increases with higher ISO speeds, shooting at low ISO speeds is
recommended.
 If [Additive] is set, the image processing after taking the multiple
exposures will take time. (The access lamp will light up longer.)
 If you perform Live View shooting with [Additive] set, the Live View
function will stop automatically when the multiple-exposure shooting
ends.
 In step 7, the brightness and noise of the multiple-exposure image
displayed during Live View shooting will be different from the final
multiple-exposure image recorded.
 Multiple-exposure shooting will be canceled if the power switch is set to
<2> or if you switch to movie shooting.
 If you switch the shooting mode to a Basic Zone mode, <w>, or <x>
during shooting, multiple-exposure shooting will end.
 If you connect the camera to a computer, multiple-exposure shooting will
not be possible. If you connect the camera to a computer during
shooting, multiple-exposure shooting will end.
You can press the <x> button to view the multiple exposures taken so far
or delete the last single exposure (p.217).