Canon EOD 50D Instruction Manual page 183

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Custom Function Settings"*
C.Fn IV -5 Focusing Screen
If you change the focusing screen, change this setting to match the
focusing screen type. This is to obtain the correct exposures.
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.
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0
08 0
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0
- 0 1 -
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0
0
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Ef-S: Super Precision Matte
Focusing screen which makes manual focusing easier than with
the Ef-A. Effective for users who mainly focus manually.
o
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.
[i] •
Even if all the Custom Functions are cleared, this setting will be retained.
• Since the standard Ef-A focusing screen comes
with the EOS 500, C.Fn
IV -5-0 is already set.
• To change the focusing screen, refer to the instructions that come with
the focusing screen.
• The C.Fn IV -5 setting is not included in the registered camera user
settings (p.186).
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