Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 251)

251
P Multiple Exposures
8
Shoot subsequent exposures.
X When [ On:Func/Ctrl ] is set, the
merged multiple-exposure image will
be displayed.
Live View shooting with [ On:Func/
Ctrl ] set, the multiple-exposure
images merged so far will be
displayed. By pressing the <
B >
button, you can display only the Live
View image.
Multiple-exposure shooting will end
when the set number of exposures
are taken. With continuous shooting,
if you keep holding down the shutter
button, the shooting continues until
the set numbers of exposures are
taken.
When [ On:Func/Ctrl ] is set, you can press the < x > button to view the
multiple exposures taken so far or delete the last single exposure
(p.254).
The shooting information for the last shot will be recorded and appended
to the multiple-exposure image.