Sony A7c has a
24.0MP Full frame (35.8 x 23.8 mm ) sized BSI-CMOS sensor and features Bionz X processor. On the other hand, Pentax K-S1 has a
20.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor and features Prime MII processor.
One other difference between these two cameras that is worth mentioning is that Pentax K-S1's sensor doesn't have an anti-alias (Low-Pass) filter. Removing anti-alias filter increases the sharpness and level of detail but at the same time, it increases the chance of moiré occurring in certain scenes.
Below you can see the A7c and K-S1 sensor size comparison.
As seen above, Sony A7c has a 2.3x Larger sensor area than Pentax K-S1. 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 Sony A7c and Pentax K-S1 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, A7c has scored 95, 17 points higher than K-S1.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Sony A7c |
95 |
25.0 bits |
14.7 Evs |
3407 ISO |
Pentax K-S1 |
78 |
23.5 bits |
13.0 Evs |
1061 ISO |