Sony A100 has a 10.0MP APS-C (23.6 x 15.8 mm ) sized CCD sensor . On the other hand, Olympus E-M1 has a 16.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features TruePIC VII processor.
Olympus E-M1's sensor provides 6MP more than Sony A100'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 A100 and E-M1 sensor size comparison.
![Sony A100 vs Olympus E-M1 Sensor Size Comparison]()
Sensor Size and Resolution Comparison image of Sony A100 and Olympus E-M1 Cameras
As seen above, Sony A100 has a 1.7x Larger sensor area than Olympus E-M1. 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
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. It 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. Sony A100 and Olympus E-M1 sensors have been tested by DxO and the results show that E-M1 has a better overall score of 73, 12 points higher compared to A100's score of 61.
| Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
|
Sony A100 |
61 |
22.0 bits |
11.2 Evs |
476 ISO |
|
Olympus E-M1 |
73 |
23.0 bits |
12.7 Evs |
757 ISO |