Pentax 645Z has a
51.0MP Medium format (44 x 33 mm ) sized CMOS sensor and features PRIME III processor. On the other hand, Panasonic S1R has a
47.0MP Full frame (36 x 24 mm ) sized CMOS sensor and features Venus Engine processor.
Another similarity between these two cameras is that both Panasonic S1R and Pentax 645Z sensors lack anti-alias (Low-Pass) filters. 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 645Z and S1R sensor size comparison.
As seen above, Pentax 645Z has a 1.7x Larger sensor area than Panasonic S1R. 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 645Z and Panasonic S1R 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, 645Z has scored 101, 1 points higher than S1R.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Pentax 645Z |
101 |
26.0 bits |
14.7 Evs |
4505 ISO |
Panasonic S1R |
100 |
26.4 bits |
14.1 Evs |
3525 ISO |