Canon EOS50D EOS 50D Instruction Manual - Page 183
C.Fn IV -5, Focusing Screen
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3 Custom Function SettingsN 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. 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. Even if all the Custom Functions are cleared, this setting will be retained. Since the standard Ef-A focusing screen comes with the EOS 50D, 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). 183