Tamron 20-40 mm f/2.8 Di III VXD review - Summary

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Tamron 20-40 mm f/2.8 Di III VXD

19 July 2023

Maciej Latałło

11. Summary

Pros:

very good image quality in the frame centre across the whole focal range,
sensible image quality on the edge of the APS-C sensor,
lack of more serious problems with longitudinal chromatic aberration,
negligible lateral chromatic aberration,
low spherical aberration,
moderate astigmatism,
silent, quick, and accurate autofocus,
slight vignetting on the APS-C sensor,
sensible performance against bright light,
moderate "focus breathing".

Cons:

high vignetting on full frame,
noticeable distortion on the widest angle of view.

Our expectations we voiced at the beginning, that the limited focal range of 20-40 mm might allow Tamron to construct a handy, lightweight lens which would be also optically very efficient, proved to be right. Our list of pros is very long and includes very significant positions. The list of cons, for a change, is nicely short and it includes just completely predictable issues which, additionally, can be corrected by appropriate software. In case of distortion, for example, it was made easy by the producers as they offered you some field of view to spare.

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The current price of the Tamron 20-40 mm f/2.8 Di III VXD reaches $700 and it's rather high, being $100-$200 lower than the price of such models as the Sigma C 16-28 mm f/2.8 DG DN or the Tamron 17-28 mm f/2.8 DI III RXD that are more difficult to construct. We would complain about this fact a lot more if only the tested lens fared poorly in our tests. As its results are very good you just have to sigh and get over it. Perhaps, after all, it is well adjusted to the parameters and performance, offered by this lens.