Pentax K-x has a
12.0MP APS-C (23.6 x 15.8 mm ) sized CMOS sensor and features Prime processor. On the other hand, Canon SL3 has a
24.0MP APS-C (22.3 x 14.9 mm ) sized CMOS sensor and features DIGIC 8 processor.
Canon SL3's sensor provides 12MP more than Pentax K-x'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 K-x and SL3 sensor size comparison.
Sensor Size and Resolution Comparison image of Pentax K-x and Canon SL3 Cameras
As seen above, Pentax K-x has a 1.1x Larger sensor area than Canon SL3. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in 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
Pentax K-x
or the
Canon SL3 ,
including hyperfocal distance.
