The ZX212ST has a maximum resolution of XGA (1024x768). That's 62% less resolution than the most common native projector resolution of 1080p (1920x1080).
An XGA (1024x768) native projector resolution is actually the worst resolution amongst all multimedia projectors of this age and type.
A 1080p (1920x1080) native projector resolution is the best resolution across comparable types of projector.
We compared this data projector to all the other multimedia projectors that have a resolution of XGA (1024x768) and we think the Acer K520 which has a better Rating is also worth considering.
If the resolution of this Optoma projector is too low for you then you might also want to look at the Optoma ZW212ST (WXGA (1280x800)), the Hitachi CP-AW3019WNM (WXGA (1280x800)), or the Benq LW61 (WXGA (1280x800)) which also has a higher rating.