LensTip.com

Lens review

Pentax HD DA 20-40 mm f/2.8-4.0 ED Limited DC WR

8 February 2014
Arkadiusz Olech

6. Distortion

With such a small range of focal lengths and the maximum angle of view amounting to 70 degrees we didn’t expect huge distortion problems and, by and large, we didn’t notice any major issues here; however, you can’t say that aberration is corrected in a perfect way. At 20 mm focal length you have to take into account barrel distortion of −2.86%, which decreases to −1.08% in the middle of the focal range and then to −0.47% at 40 mm.

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20 mm
Pentax HD DA 20-40 mm f/2.8-4.0 ED Limited DC WR - Distortion
30 mm
Pentax HD DA 20-40 mm f/2.8-4.0 ED Limited DC WR - Distortion
40 mm
Pentax HD DA 20-40 mm f/2.8-4.0 ED Limited DC WR - Distortion