Olympus SP-800 UZ has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features TruePic III processor. On the other hand, GoPro Hero9 Black has a
23.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CMOS sensor and features GP1 processor.
GoPro Hero9 Black's sensor provides 9MP more than Olympus SP-800 UZ's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the SP-800 UZ and Hero9 Black sensor size comparison.
Sensor Size and Resolution Comparison image of Olympus SP-800 UZ and GoPro Hero9 Black Cameras
Olympus SP-800 UZ and GoPro Hero9 Black have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture.
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Olympus SP-800 UZ
or the
GoPro Hero9 Black ,
including hyperfocal distance.