Optoma S321 - Display Aspect Ratio Menu

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USING THE PROJECTOR
Display aspect ratio menu
Aspect Ratio
Select the aspect ratio of the displayed image between the following options:
4:3  : This format is for 4:3 input sources.
16:9  : This format is for 16:9 input sources, like HDTV and DVD enhanced for Wide screen TV.
16:10 (for WXGA and WUXGA models only)  : This format is for 16:10 input sources, like widescreen
laptops.
LBX (except SVGA and XGA models)  : This format is for non-16x9, letterbox source and if you use
external 16x9 lens to display 2.35:1 aspect ratio in full resolution.
Native  : This format displays the original image without any scaling.
Auto  : Automatically selects the appropriate display format.
Note:
Detailed informations about LBX mode: 
Some Letter-Box Format DVDs are not enhanced for 16x9 TVs. In this situation, the image ±
will not look right when displaying image in 16:9 mode. In this situation, please try to use the
4:3 mode to view the DVD. If the content is not 4:3, there will be black bars around the image
in 16:9 display. For this type of content, you can use LBX mode to ll the image on the 16:9
display.
If you use an external anamorphic lens, this LBX mode also allows you to watch a 2.35:1 ±
content (include Anamorphic DVD and HDTV lm source) that supports anamorphic wide is
enhanced for 16x9 Display in a wide 2.35:1 image. In this case, there are no black bars. Lamp
power and vertical resolution are fully utilized.
To use the superwide format, do the following: 
Set the screen aspect ratio to 2.0:1.a)
Select “Superwide” format.b)
Align the projector image correctly on the screen.c)
SVGA/XGA scaling table:
Source 480i/p 576i/p 1080i/p 720p
4x3 Scale to 1024x768.
16x9 Scale to 1024x576.
Native No scaling will be made; the image is displayed with the resolution based on input source.
Auto -If source is 4:3, the screen type will be scaled to 1024x768.
-If source is 16:9, the screen type will be scaled to 1024x576.
-If source is 15:9, the screen type will be scaled to 1024x614.
-If source is 16:10, the screen type will be scaled to 1024x640.