Sony DSLR-A900 User Guide

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Setup menu
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You can change the focusing screen to Type L (not supplied) or Type M 
(not supplied) according to your purpose. Select the appropriate setting for 
the type of screen after changing the screen itself.
Notes
• If the type of screen is not properly set, you cannot measure the light properly.
• For details on how to change the focusing screen, refer to the operating instructions 
supplied with the focusing screen.
Focusing Screen
Type G
Standard focusing screens (the default one).
Type M
Focusing screens that make it easier to check the peak of the 
focus and approximate sharpness. This is suitable for a 
brighter lens (F1.4 to 2.8).
Type L
Focusing screens that are equipped with a grid. The 
brightness of the viewfinder is the same as that of the G type.