Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 511)

511
Troubleshooting Guide
If [ 8 5: Focusing screen ] is set to [ Ec-A, B, L ] (p.435), the spot
metering circle will not be displayed at the viewfinder center.
If [ On:ContShtng ] is set, image review immediately after image
capture or image playback is not possible during shooting (p.248).
When the image size is set to 41 or 61 , the multiple-exposure
image will be recorded in 1 quality (p.255).
If you shoot at night when the background is dark, the shutter speed
automatically becomes slow (slow-sync shooting) so that both the
subject and background are properly exposed. To prevent a slow
shutter speed, under [
z 3: External Speedlite control ], set [ Flash
sync. speed in Av mode ] to [ 1/250-1/60sec. auto ] or [ 1/250 sec.
(fixed) ] (p.264).
Make sure the flash (or PC sync cord) is securely attached to the
camera.
If you use a non-Canon flash unit with Live View shooting, set [ z 5:
Silent LV shoot. ] to [ Disable ] (p.281).
The spot metering circle is not displayed.
The shot image is not displayed during multiple-exposure
shooting.
The multiple-exposure image is shot in 1 quality.
When I use the < f > mode with flash,
the shutter speed becomes slow.
The flash does not fire.