The NP-PA571 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 common resolution supported by data projectors of this spec and age. 640 x 480 (VGA) is also supported by this projector. This multimedia projector also support supported graphics resolutionss of 1024 x 768 (XGA), 1280 x 1024 (SXGA), 1400 x 1050 (SXGA+) and 1600 x 1200 (UXGA) and 800 x 600 (SVGA).
This data projector's resolution (1920 x 1200 (WUXGA)) is in fact the best supported resolution across all 5000:1 contrast ratio multimedia projectors that were released around the same time as the NP-PA571.
A 640 x 480 (VGA) supported graphics resolutions is the worst supported resolution amongst similar types of data projector.