Sony DSLR-A100 - Manual (Page 90)

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For details on the operation 1 page 80
You can select the index screen format from the following settings.
Index format
16 image Displays 16 images on the screen.
9 image Displays nine images on the screen.
4 image Displays four images on the screen.
File browser Displays six images on the screen from folder to folder.
9 images 4 images File browser 16 images