The Benq MX570 supports a maximum resolution of 1920 x 1200 (WUXGA). That's over seven times the resolution of a 640 x 480 (VGA) multimedia projector, which is the most frequently found resolution supported by projectors of this age and spec.
This projector's resolution (1920 x 1200 (WUXGA)) is in fact the best supported resolution across all projectors that are a similar age to the MX570.
Across comparable types of projector the worst supported resolution is 640 x 480 (VGA).
If the resolution of this projector is not high enough for you then you might also want to look at the MX525 ($324.99) (1600 x 1200 (UXGA)|640 x 480 (VGA)), or the MX507 (640 x 480 (VGA)|1600 x 1200 (UXGA)) both from Benq or the Acer X133 (1280 x 800 (WXGA)|1920 x 1200 (WUXGA)) which also has a higher Rating.