Canon EOS-1D Mark IV Brochure page 13

Focusing plane
Prime lens
(Image plane)
Subject
25
CMOS area sensor
Secondary
image-forming lens
3.00
2.25
4.5
6.6
7.50
Evaluative/Center-Weighted
Partial metering
average metering
(C
(C
Spot metering
* C.Fn I -7-1 enables AF point-linked Spot metering.
Sync
contacts
Semiconductor
External switch
Speedlite (Electronic
X-sync contact)
MPU Shutter PR
Semiconductor
Non-Canon switch
(Electronic
flash
X-sync contact)
PC
terminal
26