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Lens review

Sigma 19 mm f/2.8 EX DN

15 May 2012
Szymon Starczewski

6. Distortion

The constructors of Olympus and Panasonic optics for the Micro 4/3 system ease up completely on the distortion correction, leaving it to a camera’s software. As a result the Olympus 2.8/17 had a huge barrel distortion level of – 5.45% and the Panasonic 1.7/20 reached a lower but also not exactly commendable value of –3.66%.

The constructors of the Sigma optics used quite different, and a rather classic approach which suits us much better. In the case of photos taken with the Olympus E-PL1 the distortion is exactly the same for RAW and JPEG files, amounting to –1.44% which is a moderate value, definitely lower than in the case of its competitors.

When we pass to a bigger sensor of the Sony NEX-7 the distortion increases but fortunately not much. In this case it remains the same for JPEG and RAW files, getting to –1.73%.

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Olympus E-PL1, JPEG
Sigma 19 mm f/2.8 EX DN  - Distortion
Olympus E-PL1, RAW
Sigma 19 mm f/2.8 EX DN  - Distortion
Sony NEX-7, JPEG
Sigma 19 mm f/2.8 EX DN  - Distortion
Sony NEX-7, RAW
Sigma 19 mm f/2.8 EX DN  - Distortion