Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 248)

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You can shoot two to nine exposures to be merged into one image. With
Live View shooting (p.271), you can see in real time how the exposures
are merged when you shoot multiple-exposure images.
1
Select [Multiple exposure].
Under the [ z 1 ] tab, select [ Multiple
exposure ], then press < 0 >.
X The multiple exposure setting screen
will appear.
2
Set [Multiple exposure].
Select [ On:Func/Ctrl ] or
[ On:ContShtng ], then press < 0 >.
To exit shooting multiple exposures,
select [
Disable ].
On: Func/Ctrl (Function and control priority)
Useful when you want to shoot multiple exposures while checking
the result as you proceed. During continuous shooting, the
continuous shooting speed will decrease greatly.
On: ContShtng (Continuous shooting priority)
Geared for continuous multiple-exposure shooting of a moving
subject. Continuous shooting is possible, but the following
operations are disabled during shooting: menu viewing, image
review after image capture, image playback, and undo last image
(p.254). Also, during Live View shooting, the image displayed will not
be the final merged image.
Only the multiple-exposure image will be saved. (The single
exposures merged in the multiple-exposure image will not be
saved.)
P
Multiple Exposures