Both Sony A37 and Panasonic GH3 have 16.0 MP resolution sensors but Sony A37's sensor is APS-C (23.5 x 15.6 mm ) and Panasonic GH3's sensor is Four Thirds (17.3 x 13 mm ).
Since Sony A37's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Panasonic GH3.
Below you can see the A37 and GH3 sensor size comparison.
As seen above, Sony A37 has a 1.6x Larger sensor area than Panasonic GH3. 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 A37 and Panasonic GH3 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, A37 has scored 75, 4 points higher than GH3.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Sony A37 |
75 |
23.3 bits |
12.9 Evs |
799 ISO |
Panasonic GH3 |
71 |
22.7 bits |
12.4 Evs |
812 ISO |