Sigma 12-24 mm f/4.5-5.6 II DG HSM
6. Distortion
It isn’t difficult to guess that the most deformation problems you will encounter on full frame. At the widest angle of view you deal with a noticeable “barrel” which value we determined as –2.67%. What’s important in this case a slightly moustache-like nature of this aberration can be noticed. The lines on the very edge of the frame start to bend in the opposite direction. It becomes even more pronounced in the middle of the focal range where, on full frame, the official result amounts to –0.17%. Supposedly not a high value but it stems from averaging the results across the frame. If you look more closely and remind yourself the situation on the D200, it turns out that in the middle of the frame there is a “pincushion” with a value distinctly higher than 1% and on the edge – “barrel” distortion exceeding the level of –1%. Pincushion distortion increases with the rise of the focal length value and at 24 mm it reaches a visible level of 2.13%.
It should be additionally remembered here that keeping straight lines with such extremely wide angles of view is very difficult and can be achieved only at the expense of significant oversharpness. If you value your life don’t even try taking photos of your partner while her face is situated in the corners of the frame.
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| Nikon D200, 12 mm | |||
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| Nikon D200, 18 mm | |||
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| Nikon D200, 24 mm | |||
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| Nikon D3x, 12 mm | |||
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| Nikon D3x, 18 mm | |||
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| Nikon D3x, 24 mm | |||
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