Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 510)

Troubleshooting Guide
510
The maximum burst displayed in the viewfinder does not change when
you change the card, even if it is a high-speed card. The maximum
burst shown in the table on page 158 is based on Canon’s testing
card. (The faster the card’s writing speed, the higher the actual
maximum burst will be.) Therefore, the maximum burst displayed in
the viewfinder may differ from the actual maximum burst.
If [ z 2: Highlight tone priority ] is set to [ Enable ], the settable ISO
speed range will be ISO 200 - ISO 51200. Even if you set [ Range for
stills ] to expand the setting range, you cannot select L (equivalent to
ISO 50), H1 (equivalent to ISO 102400), H2 (equivalent to ISO
204800), or H3 (equivalent to ISO 409600). When [
z 2: Highlight
tone priority ] is set to [ Disable ] (p.193), you can set ISO 100/125/
160, L, or H1/H2/H3.
Set [ z 2: Auto Lighting Optimizer ] to [ Disable ] (p.189). When
[ Low ], [ Standard ], or [ High ] is set, even if you set a decreased
exposure compensation or flash exposure compensation, the image
may come out bright.
See page 237 to set the exposure compensation.
For flash shooting, exposure compensation cannot be set.
Even after I change the card, the maximum burst
displayed for continuous shooting does not change.
ISO 100 cannot be set. ISO speed expansion cannot be selected.
Even if I set a decreased exposure compensation,
the image comes out bright.
I cannot set the exposure compensation while
both manual exposure and ISO Auto are set.