Sony A900 has a
25.0MP Full frame (35.9 x 24 mm ) sized CMOS sensor and features Bionz processor. On the other hand, Panasonic GX8 has a
20.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features Venus Engine processor.
Sony A900's sensor provides 5MP more than Panasonic GX8'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 A900 and GX8 sensor size comparison.
As seen above, Sony A900 has a 3.8x Larger sensor area than Panasonic GX8. 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 A900 and Panasonic GX8 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, A900 has scored 79, 4 points higher than GX8.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Sony A900 |
79 |
23.7 bits |
12.3 Evs |
1431 ISO |
Panasonic GX8 |
75 |
23.5 bits |
12.6 Evs |
806 ISO |