Pentax smc DA 35 mm f/2.4 AL review - Chromatic aberration

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Pentax smc DA 35 mm f/2.4 AL

5 April 2011

Arkadiusz Olech

5. Chromatic aberration

Longitudinal chromatic aberration in the tested lens is not corrected in a perfect way. You can see it in the autofocus chart photo from chapter 10. Images situated behind the focus line are slightly yellow and those in front of the focus line have red-purple tint.

The mystery of the slow resolution increase on the edge of the frame after stopping down the aperture is partially solved by the graph below.

Pentax smc DA 35 mm f/2.4 AL - Chromatic aberration

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Lateral chromatic aberration shows a very distinct growing trend with the increase of the aperture value. It prevents the resolution from reaching levels as high as those which could be available if the aberration was corrected in a perfect way.

We must emphasize very strongly the fact that the lateral chromatic aberration in itself is not a huge problem of the tested lens. Near the maximum relative aperture it remains negligible and only after a significant stopping down it reaches the medium level. Here the Pentax wins the duel with the Nikkor 1.8/35 which showed high lateral aberration – ranging from 0.13 to 0.17%.