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Lens review

2010-04-20
 

Samyang 14 mm f/2.8 ED AS IF UMC

6. Distortion

One of the more serious slip-ups of the previous Samyang 2.8/14 version was its distortion. You could notice a distinct “barrel” on the Nikon D200 and we measured its level as –3.78%. On passing to the full frame this aberration officially decreased but only because it changed into a very complicated moustache distortion.

How does the problem of geometric deformations look in this version of the lens? Unfortunately we have bad news. The producer decided to improve the resolution and the work against bright light at all costs so they forgot about the distortion. As a result the distortion increased significantly. On a small sensor we get barrel distortion reaching a high value of –5.44% and on the full frame it increases officially to the level of –7.21% although a noticeable moustache distortion appears there as well!

I would like to stress that the distortion (even very complicated) can be easily corrected using different graphic programs. There’s just one “but” – such a huge barrel distortion moves a significant portion of the image outside the frame – these fragments simply won’t be registered. The distortion correction can make the lines straight again but it won’t be able to reconstruct a non-registered image. If you want a frame without any empty spaces you must crop it and, by doing so, limit the field of view of our ultra wide-angle lens. However, you buy such lenses exactly in order to get the widest field of view…

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DX, 14 mm
Samyang 14 mm f/2.8 ED AS IF UMC - Distortion
FX, 14 mm
Samyang 14 mm f/2.8 ED AS IF UMC - Distortion

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