Olympus E-330 has a
7.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor . On the other hand, Olympus E-30 has a
12.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features TruePic III+ processor.
Olympus E-30's sensor provides 5MP more than Olympus E-330'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-330 and E-30 sensor size comparison.
Sensor Size and Resolution Comparison image of Olympus E-330 and Olympus E-30 Cameras
Olympus E-330 and Olympus E-30 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-330 has 65% larger pixel area compared to Olympus E-30, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.
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-330
or the
Olympus E-30 ,
including hyperfocal distance.
