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Lens review

Panasonic Leica DG Summilux 25 mm f/1.4 ASPH.

5 September 2011
Szymon Starczewski

6. Distortion


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When we take photos in the JPEG format the camera corrects distortion automatically. Its level, in such a case, is imperceptible; our measurements determined it as –0.22%.

How the optics really corrects the distortion (and this is, after all, the right thing to be assessed in a test of a lens) is shown by RAW files, developed by an independent program, like dcraw, used by us. Here the distortion is much more pronounced – quite distinct “barrel” which level we determined as –2.30%. It is hardly an imperceptible value but not a serious reason to complain either. The results on a level of –2% on full frame had also many 1.4/50 class lenses. In their cases it is easier to correct the distortion, though, because of a longer focal length and a bigger distance from the optics to the sensor. To keep the balance we can also remind here the result of the 4/3 system Leica 1.4/25, which was slightly lower than –1%.

Olympus E-PL1, JPEG
Panasonic Leica DG Summilux 25 mm f/1.4 ASPH. - Distortion
Olympus E-PL1, RAW
Panasonic Leica DG Summilux 25 mm f/1.4 ASPH. - Distortion