YI 4K has a 12.0MP (6.17 x 4.55 mm ) sized CMOS sensor and features Ambarella A9SE75 processor. You can shoot at maximum resolution of 4000 x 3000 pixels with aspect ratios of 4:3 and 16:9. 4K has a native ISO range of 400 - 6400 but unfortunately, YI 4K doesn't have RAW file support. If you need a Action Camera camera with a RAW support, consider
YI 4K 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 YI 4K vs Canon SX740 HS or take a look at Highest resolution Action cameras list.
Let's look at how the size of the YI 4K's sensor compares with other standard sensor sizes.
Comparison image of YI 4K Sensor Size with other standard sensors
Sensor size is what determines the circle of confusion, and therefore how much
depth of field YI 4K gives you at any given aperture.
You can
calculate
the exact depth of field for the YI 4K
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.
