Optoma EX785 Manual page 62

Appendices
Image has vertical flickering bar
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Image is out of focus
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The image is stretched when displaying 16:9 DVD title
When you play anamorphic DVD or 16:9 DVD, the projector will
show the best image in 16:9 format in OSD. If you play 4:3 format
DVD title, please change the format as 4:3 in projector OSD. If the
image is still stretched, you will also need to adjust the aspect ratio
by referring to the following:
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Image is too small or too large
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English
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Use Frequency to make an adjustment. See page 42 for more
information.
Check and reconfigure the display mode of your graphic card
to make it compatible with the projector.
Make sure the lens cap is removed.
Adjusts the Focus Ring on the projector lens.
Make sure the projection screen is between the required
distances from the projector. See pages 24-25 for more
information.
Please setup the display format as 16:9 (wide) aspect ratio type
on your DVD player.
Adjust the Zoom Ring on the top of the projector.
Move the projector closer to or further from the screen.
Press [Menu] button on the remote control or projector panel,
go to Display | Format and try the different settings.