Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 441)

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3 Custom Function Settings
C.Fn7: Others
Add cropping information C.Fn7
If you set the cropping information, vertical lines for the aspect ratio
you set during the Live View shooting will be displayed on the screen.
You can then compose the shot as if you were shooting with a
medium- or large-format camera (6x6 cm, 4x5 inch, etc.).
When you take a picture, the aspect ratio information for cropping the
image with the Digtal Photo Professional (EOS software, p.552) will be
appended to the image. (The image is recorded to the card without
being cropped.)
If you transfer the image to a computer, you can use Digital Photo
Professional to easily crop the image to the aspect ratio that was set at
the time of shooting.
OFF : Off (aspect ratio 3:2) 6:7 : Aspect ratio 6:7
6:6 : Aspect ratio 6:6 5:6 : Aspect ratio 10:12
3:4 : Aspect ratio 3:4 5:7 : Aspect ratio 5:7
4:5 : Aspect ratio 4:5
Cropping information will also be appended for viewfinder shooting.
However, the cropping range will not be displayed.
Even if a RAW image with cropping information added is processed with
the camera (p.394), the JPEG image cannot be saved as a cropped
image. When the RAW image is developed, the JPEG image with
cropping information will be saved.