Canon 77D has a
24.0MP APS-C (22.3 x 14.9 mm ) sized CMOS sensor and features DIGIC 7 processor. On the other hand, Pentax K-x has a
12.0MP APS-C (23.6 x 15.8 mm ) sized CMOS sensor and features Prime processor.
Canon 77D'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 77D and K-x sensor size comparison.
Sensor Size and Resolution Comparison image of Canon 77D and Pentax K-x Cameras
As seen above, Pentax K-x has a 1.1x Larger sensor area than Canon 77D. 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.
DxOMark Sensor Scores
Both Canon 77D and Pentax K-x sensors have been tested by DxoMark. DxoMark scores camera sensors for color depth (DXO Portrait), dynamic range (DXO Landscape) and low-light sensitivity (DXO Sports), and also gives them an overall score. Of the two cameras that we are comparing, 77D has scored 78, 6 points higher than K-x.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon 77D
78
23.6 bits
13.3 Evs
971 ISO
Pentax K-x
72
22.8 bits
12.5 Evs
811 ISO
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
Canon 77D
or the
Pentax K-x ,
including hyperfocal distance.
