Optoma RMC-25key - Manual (Page 27)

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English
User Controls
Display
Format
Use this function to choose your desired aspect ratio.
 4:3: This format is for 4x3 input sources not enhanced for Wide
screen TV.
 16:9 I: This format is for 16x9 input sources, like HDTV and
DVD enhanced for Wide screen TV. (Better format: 576i/p)
 16:9 II: This format is for 16x9 input sources, like HDTV and
DVD enhanced for Wide screen TV. (Better format: 480i/p)
 Window: When a 4:3 image is bigger than a 16:9 screen, select
the “Window” mode to fit the image onto the screen without
changing the projection distance.
 AUTO: Automatically selects the appropriate display format.
Source 480i/p 576i/p 720p 1080i PC
4:3 Scale to 1024 x 768
16:9 I Scale to 1024 x 576
16:9 II Scale to 854 x 480
Window Scale to 768 x 576