Canon EOS 5Ds Instruction Manual page 231

Merging Multiple Exposures with an Image Recorded on the Card
You can select a 1 image recorded on the card as the first single
exposure. The image data of the selected 1 image will remain intact.
You can only select 1 images. You cannot select 41/61 or
JPEG images.
The following cannot be selected as the first single exposure: Images
shot with [z3: Highlight tone priority] set to [Enable], images whose
[z4: Crop/aspect ratio] is set to any setting other than [Full-frame]
(p.154), and images having cropping information (p.411).
[Disable] will be applied for [z1: Lens aberration correction] and
[z2: Auto Lighting Optimizer] regardless of the settings of the 1
image selected as the first single exposure.
The ISO speed, Picture Style, high ISO speed noise reduction, and color space,
etc. set for the first 1 image will also be applied for the subsequent images.
If [z3: Picture Style] is Auto for the RAW image selected as the first
1 image, Standard will be applied for shooting.
You cannot select an image taken with another camera.
Select [Select image for multi. expo.].
1
The images on the card will be
displayed.
Select an image.
2
Turn the <5> dial to select the
image to be used as the first single
exposure, then press <0>.
Select [OK].
The file number of the selected image
will be displayed at the bottom of the
screen.
Take the picture.
3
When you select the first image, the
number of remaining exposures as set
with [No. of exposures] will decrease
by 1. For example, if [No. of
exposures] is 3, you can shoot two
exposures.
P Multiple ExposuresN
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