Canon SX7 Mark II
The REALiS is about as bright and powerful as compact projectors get.
The Optoma HD66 is definitely a better option for budget buyers, since it doesn't cost thousands of dollars. You'll definitely give up a lot of brightness and other aspects of performance, but as long as you keep the room dim, you shouldn't have a problem. If you're looking for raw power and don't mind an investment, however, the Canon SX7 Mark II is the better buy.
Blacks & Whites
The SX7 Mark II is significantly brighter than the HD66, as would be expected from such an expensive projector. Neither projector can maintain their black levels on a bright screen, however.
Neither projector had a problem with our color test. Both had decently accurate RGB curves and solid color temperatures.
Both projectors had issues with motion blur and some artifacting issues, especially with nonnative content.
The SX7 Mark II has a larger zoom, which gives users a lot more flexibility for where the projector is placed in the room. The Optoma has a poor zoom and doesn't have a very good throw. If you're looking to display in a bright room, the SX7 Mark II is definitely more capable.
Both projectors have decent number of ports, but neither have an ethernet port or card slots for media playback.
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