Pentax K-S1 has a
20.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor and features Prime MII processor. On the other hand, Canon 100D has a
18.0MP APS-C (22.3 x 14.9 mm ) sized CMOS sensor and features Digic 5 processor.
Another difference between these two cameras is that Pentax K-S1's sensor lacks 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 K-S1 and 100D sensor size comparison.
Sensor Size and Resolution Comparison image of Pentax K-S1 and Canon 100D Cameras
As seen above, Pentax K-S1 has a 1.1x Larger sensor area than Canon 100D. 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 Pentax K-S1 and Canon 100D 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, K-S1 has scored 78, 15 points higher than 100D.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Pentax K-S1
78
23.5 bits
13.0 Evs
1061 ISO
Canon 100D
63
21.8 bits
11.3 Evs
843 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
Pentax K-S1
or the
Canon 100D ,
including hyperfocal distance.
