Olympus E-450 has a
10.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features TruePic III processor. On the other hand, Sony A58 has a
20.0MP APS-C (23.2 x 15.4 m ) sized CMOS sensor .
Sony A58's sensor provides 10MP more than Olympus E-450'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 E-450 and A58 sensor size comparison.
As seen above, Sony A58 has a 1.5x Larger sensor area than Olympus E-450. 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. Olympus E-450 and Sony A58 sensors have been tested by DxO and the results show that A58 has a better overall score of 74, 18 points higher compared to E-450's score of 56.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Olympus E-450 |
56 |
21.5 bits |
10.5 Evs |
512 ISO |
Sony A58 |
74 |
23.3 bits |
12.5 Evs |
753 ISO |