FujiFilm Z800EXR has a 12.0MP 1/2-inch (6.4 x 4.8 mm ) sized CCD sensor and features EXR processor. You can shoot at maximum resolution of 4000 x 3000 pixels with aspect ratios of 4:3 and 16:9. Z800EXR has a native ISO range of 100 - 1600 which can be boosted to 3200 but unfortunately, FujiFilm Z800EXR doesn't have RAW file support. If you need a Compact camera with a RAW support, consider or in the same price range.
FujiFilm Z800EXR is not the highest resolution Small Sensor camera. Canon SX740 HS with its 21.0MP sensor is leading in this class. Check the comparison of FujiFilm Z800EXR vs Canon SX740 HS or take a look at Highest resolution Compact cameras list.
Let's look at how the size of the FujiFilm Z800EXR's 1/2-inch sensor compares with other standard sensor sizes.
Comparison image of FujiFilm Z800EXR Sensor Size with other standard sensors
Sensor size is what determines the circle of confusion, and therefore how much
depth of field FujiFilm Z800EXR gives you at any given aperture.
You can
calculate
the exact depth of field for the FujiFilm Z800EXR
at any focal length, aperture and subject distance, including the hyperfocal distance
for landscapes and how close you can get before the focus zone becomes too thin.