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Lens review

Tamron SP 45 mm f/1.8 Di VC USD

13 October 2015
Szymon Starczewski

6. Distortion

The chart below presents a comparison between distortion results of different full frame standard lenses with the aperture close to f/1.8.


Canon
1.8/50 STM
Canon
1.8/50 II
Nikkor
AF-S 1.8/50G
Nikkor
AF 1.8/50D
Minolta
1.7/50
Tamron
SP 1.8/45
APS-C/DX
−0.41%
−0.39%
−0.49%
−0.20%
−0.30%
−0.31%
FF
−1.31%
−1.28%
−1.18%
−0.49%
−0.68%
−0.58%


The Tamron fares here exceedingly well. Out of all older constructions only the Nikkor AF 1.8/50D seems to be slightly better. Still if you take measurement errors into account the difference between those two becomes practically imperceptible.

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However it must be mentioned that the new 50 mm devices fare much better in this category than older constructions. The Sigma A 50 mm f/1.4 DG HSM is a good example – its distortion level on full frame was almost zero. On the other hand the 45 mm focal length means a slightly wider angle of view and more problems with correction of deformations so the task of the Tamron was a bit more difficult. It should be said the tested lens managed to correct the distortion very well indeed.

Nikon D7000, 45 mm
Tamron SP 45 mm f/1.8 Di VC USD - Distortion
Nikon D3x, 45 mm
Tamron SP 45 mm f/1.8 Di VC USD - Distortion