Olympus M.Zuiko Digital 17 mm f/1.8
8. Vignetting
At the maximum relative aperture the brightness loss in the frame corners reaches 49% (-1.97 EV) and it is really huge. Such a result is even worse if you remember what detector we are dealing with here. On a small Micro 4/3 sensor the vignetting is easy to correct, after all. It is not the only piece of bad news. There is no aperture which would be completely vignetting-free. By f/2.0 that aberration reaches 41% (-1.54 EV) and by f/2.8 it decreases to 29% (-0.97 EV). A noticeable drop in this aberration level can be seen when you stop down to f/4.0, with the vignetting amounting to 22% (-0.72 EV). On further stopping down there is no measurable decrease of vignetting.
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The result of the Panasonic 1.7/20 might serve as a short commentary here. A bit faster but also a much smaller device, it had the vignetting of 44% at the maximum relative aperture, lower than the Olympus, tested here…
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