The Acer S1283 supports a maximum resolution of 1920 x 1200 (WUXGA). That's 20% more resolution than a 1600 x 1200 (UXGA) data projector, which is the most common resolution supported by projectors that are a comparable age to the S1283. In addition, this data projector supports a supported graphics resolutions of 1024 x 768 (XGA).
A 1920 x 1200 (WUXGA) supported graphics resolutions is actually the best supported resolution across all 13000:1 contrast ratio projectors that were released more than two years ago.
The worst supported resolution across comparable types of projector is 640 x 480 (VGA).