The Benq MW571 supports a maximum resolution of 1920 x 1200 (WUXGA). That's over seven times the resolution of a 640 x 480 (VGA) projector, which is the most frequently found resolution supported by 13000:1 contrast ratio projectors that were released around the same time as the MW571. 640 x 480 (VGA) is also supported by this Benq data projector.
A 1920 x 1200 (WUXGA) graphics resolution is in fact the best supported resolution amongst all projectors of this age and spec.
The worst supported resolution across comparable types of data projector is 640 x 480 (VGA).