Olympus E-520 has a
10.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor . On the other hand, Panasonic GH2 has a
16.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features Venus Engine FHD processor.
Panasonic GH2's sensor provides 6MP more than Olympus E-520'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-520 and GH2 sensor size comparison.
Sensor Size and Resolution Comparison image of Olympus E-520 and Panasonic GH2 Cameras
Olympus E-520 and Panasonic GH2 have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture. On the other hand, since Olympus E-520 has 59% larger pixel area compared to Panasonic GH2, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.
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-520 and Panasonic GH2 sensors have been tested by DxO and the results show that GH2 has a better overall score of 60, 5 points higher compared to E-520's score of 55.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Olympus E-520
55
21.4 bits
10.4 Evs
548 ISO
Panasonic GH2
60
21.2 bits
11.3 Evs
655 ISO
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Olympus E-520
or the
Panasonic GH2 ,
including hyperfocal distance.
