|Upon arrival of a Olympus E-620 test sample, it is tested in our DIWA Lab. The technical data of the rigorous tests are processed and translated into understandable data. Inside the lab, testing takes place in standardized circumstances. An environment in which cameras, both compact and system concepts can be compared without a problem. Besides that, the Olympus E620 DSLR camera is extensively used in practice and evaluated as for operation and shooting in practice. This combination of lab tests and the testing in practice, results in a final conclusion that is carefully reviewed.|
|Olympus E-620 color reproduction
An item that is reviewed during testing is the color reproduction. The accuracy of the color reproduction compared to the calibrated colors of the Gretag Macbeth Color Checker is quite good. We only found a slight deviation at 200-800 ISO, although hardly visible with the naked eye; an excellent result. Naturally, we were curious about the results of a comparison between the color reproductions of both the Olympus E-620 and E-30 DSLR cameras. We find astonishing similarities at 100-800 ISO, however; from ISO 800 (1600 and 3200 ISO) we find an improved reproduction in favor of the Olympus E620. Also when it comes to white balance, the Olympus E-620 performs very well indeed, especially when applying a manual white balance. The auto white balance encounters some trouble in filtering color cast in incandescent light, yet, as said, a manual setting reaches an optimum result. Compared to the E-30, we found the Olympus E620 comes up with almost equal measurements, excellent!
Image resolution vs signal/noise ratio
Just like the E-30, the Olympus E-620 features an image resolution of 12 Megapixels. A resolution that serves nearly every purpose and should be standard for a digital camera. Still, the competitors may think differently about this, and the coming time, we will witness more and even larger amounts of Megapixel introductions. Marketing influences this process strongly. A disadvantage of the constant increase of the image resolution is that it requires adjustments to keep the signal/noise ratio under control. The Olympus E-620 lets you shoot effortlessly up to and including ISO 800 without any visible noise. ISO 1600 gets tricky and you will need to carefully sort out the correct exposure. ISO 3200 should only be used in great need; noise will definitely be visible and the picture will need fierce editing before it is decent. The E620 is in pace with the E30 when it comes to signal/noise ratio, which is quite an achievement. On the other hand you may conclude that there was no possibility to improve it.
|Olympus E-620 dynamic range
Dynamic range remained equal to the performance of het Olympus E-30. This DSLR camera managed to improve the range and paved the way for the new E620. It is rather striking to see that the E620 drops a stitch at the lowest ISO value (100). Whereas 200-800 ISO shows an excellent dynamic range, ISO 100 stays behind, however, with still a decent result. The dynamic range contributes to the image quality quite significantly and in particular to the details in a dark and light area in a contrast-rich picture. A situation that will occur frequently.
Olympus E-620 kit lens
We tested the Olympus Evolt E-620 in combination with the ZUIKO Digital 14-54mm f/2.8-f3.5 II zoom lens. This is a standard Olympus lens with a decent focal length. The test results of the sharpness of this lens are fine. In the centre as well as towards the edges, the ZUIKO lens produces excellent sharpness. It's only at a nearly minimum aperture of f/22 that the lens shows some blur in the center and towards the edges.
Olympus E-620 chromatic aberration
Chromatic aberration is a visible phenomenon at wide-angle pictures. The other focal lengths are not completely free of this purple effect, although in practice you have to make an effort to discover it. Distortion of the ZUIKO Digital 14-54mm f/2.8-f3.5 II lens is negligible. The highest amount of distortion was measured at wide angle, yet only slightly and easy to correct afterwards. At maximum aperture of f/2.8 the entire zoom range is sensitive to vignetting, although one stop aperture will lead to an excellent result over the entire aperture range.