Canon EOS 5D Instruction Manual page 158

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Custom Function Settings
*
The camera provides interchangeable focusing screens. This Custom
Function must be set so that the exposure correction matches the
respective focusing screen.
0: Ee-A
1: Ee-D
2: Ee-S
About focusing screen characteristics
Ee-A: Standard Precision Matte
Standard focusing screen that comes with the camera. Provides
good viewfinder brightness and enables easy manual focusing.
Ee-D: Precision Matte with grid
This is the Ee-A with a grid. It makes it easier to align horizontal
or vertical lines.
Ee-S: Super Precision Matte
Focusing screen which makes manual focusing easier than with
the Ee-A. Effective for users who mainly focus manually. The
viewfinder brightness is darker than the Ee-A.
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Since the Ee-A focusing·screen comes with the.EOS 50, C.Fn-OO-O is
already set.
To change the focusing screen, follow the instructions that comes with
thefocusing screen.
The C.Fn-OO setting is
(p.148).
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