Sony DT 16-50 mm f/2.8 SSM
6. Distortion
At 16 mm, averaging the distortion for the whole image, we get a very high value of –5.29%. It’s still not the end of it. This result is still lowered by the influence of the edges where the lines, bending the other way, correct it a bit. When we cut out 60-70% of the area in the frame centre and measure the distortion there we get “barrel” with a value of –6.3% - really monstrous for a rectilinear lens. It’s worth remembering here that the Tokina and the Pentax at the widest angle had deformations on the level of –4%.
What’s more the distortion doesn’t decrease so quickly. In other lenses with similar parameters it usually plummets with the lengthening of the focal length, becoming zero near 20-24 mm and then changing the sign and increasing slowly. For the Sony 16-50 mm at 24 mm focal length we still deal with noticeable barrel distortion which level nears the value of -2%. At 28 mm focal length we still see barrel of -0.87%. The distortion gets zero and changes the sign only at the end of the focal lengths range and at 50 mm it reaches a negligible value of 0.11%.
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In this category it is really difficult to praise the tested lens for anything at all.
| Sony A77, 16 mm | |||
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| Sony A77, 28 mm | |||
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| Sony A77, 50 mm | |||
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