The Epson 520 supports a maximum resolution of 1600 x 1200 (UXGA). That's over six times the resolution of the most common supported graphics resolutions of 640 x 480 (VGA) (which is also supported by this Epson data projector). This multimedia projector also support supported graphics resolutionss of 1280 x 800 (WXGA), 1400 x 1050 (SXGA+) and 1440 x 900 (WXGA+) and 800 x 600 (SVGA).
This projector's resolution (1600 x 1200 (UXGA)) is actually the best supported resolution amongst all data projectors that have been on the market for a similar time to the 520.
Amongst similar types of projector the worst supported resolution is 640 x 480 (VGA).