Canon EOS 40D - Manual (Page 162)

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3 Custom Function SettingsN
C.Fn IV -5 Focusing Screen
The camera provides interchangeable focusing screens. This Custom
Function must be set so that the exposure correction matches the
respective focusing screen.
0: Ef-A
1: Ef-D
2: Ef-S
About focusing screen characteristics
Ef-A: Standard Precision Matte
Standard focusing screen that comes with the camera. Provides
good viewfinder brightness and enables easy manual focusing.
Ef-D: Precision Matte with grid
This is the Ef-A with a grid. It makes it easier to align horizontal or
vertical lines.
Ef-S: Super Precision Matte
Focusing screen which makes manual focusing easier than with
the Ef-A. Effective for users who mainly focus manually.
About Super Precision Matte Ef-S and Maximum Lens Aperture
This is optimized for f/2.8 and faster lenses.
If the lens is slower than f/2.8, the viewfinder will look darker than with
Ef-A.
Since the standard Ef-A focusing screen comes with the EOS 40D, C.Fn
IV -5-0 is already set.
To change the focusing screen, refer to the instructions that came with
the focusing screen.
The C.Fn IV -5 setting is not included in the registered camera user
settings (p.165).