Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 435)

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3 Custom Function Settings
C.Fn5: Display/Operation
Focusing Screen C.Fn5
You can change the focusing screen with an Ec-series focusing screen
(sold separately) more suited for the techniques in the photography.
If you change the focusing screen, make sure to change this
setting to match the focusing screen type. This is to obtain a
correct exposure.
Std.: Ec-C6
Standard focusing screen.
: Ec-A, B, L
For Laser-matte screens.
The focusing screen setting will not be cleared even if you select [ 8 8:
Clear all Custom Func. (C.Fn) ].
To change the focusing screen, refer to the Instruction Manual of the
focusing screen.
Since the Ec-A/B/L focusing screens have a prism at the center, correct
exposures cannot be obtained with evaluative metering and spot
metering at the center. Use either center-weighted average metering or
AF point-linked spot metering (except for at the center).
Since the Ec-A/B/L focusing screens have a prism in the center, AF
based on color or facial information may not be achieved if the subject is
near the center of the viewfinder, even if [
2 4: Auto AF pt sel.: EOS
iTR AF ] is set to [ EOS iTR AF (Face priority) ] or [ EOS iTR AF ] (p.127).
Although an Ec-C/CII/CIII/CIV/CV/D/H/I/N/R/S focusing screen can be
installed in the camera, the correct exposure will not be obtained. Use a
commercially-available light meter to shoot with manual exposure or
exposure compensation.
If [ Ec-A, B, L ] is set, the spot metering circle will not be displayed at the
viewfinder center.
The Area AF frame displayed on the Ec-CIII/CIV/N/S focusing screens
does not match this camera’s AF Area.