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Olympus Zuiko Digital 25mm 1:2.8 'pancake' Gordon Laing, June 2008

More Results : Outdoor / Resolution / Corner sharpness / Fringe and macro / Geometry / Vignetting

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Olympus ZD 25mm geometry comparison

 

To measure and compare the Olympus 25mm's geometric distortion we photographed a test chart consisting of a grid pattern, using it and a number of rival lenses.

Here are the results for each lens. The images were analysed with Imatest using 5th Order line calculation and the full areas presented here at a reduced resolution.

25mm at f8
Distortion: 1.52% barrel
 
The image above was taken with the Olympus 25mm lens. Barrel distortion was measured at 1.52% which is roughly in-between the two scores shown for the 14-42mm kit zoom at its widest and longest focal lengths; as such the pancake exhibits approximately the same distortion as the kit zoom at the same 25mm focal length. So average performance there, but it's worth noting that while the 50mm appears to deliver a much less distorted result with 0.49%, this lens is actually beaten by the kit zoom in this test when it's at 42mm. Now let's see how the 25mm measures-up in our light fall-off tests.

Olympus ZD ED 50mm
Olympus ZD ED 14-42mm
Olympus ZD ED 14-42mm
Olympus ZD ED 14-42mm wide-angle geometry
Olympus ZD ED 14-42mm telephoto geometry
50mm at f8
Distortion: 0.49% barrel
  14-42mm at 14mm f8
Distortion: 2.97% barrel
  14-42mm at 42mm f8
Distortion: 0.21% barrel

Olympus ZD 25mm results continued...

Outdoor / Resolution / Corner sharpness / Fringe and macro / Geometry / Vignetting


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