Lens review

Tokina AT-X PRO SD 14-20 mm f/2 (IF) DX

30 March 2016
Arkadiusz Olech

4. Image resolution

The resolution test of the Tokina AT-X PRO SD 14–20 mm f/2 (IF) DX was based on RAW files from the Canon EOS 50D. The maximum MTFs reached by the best lenses tested on that body amount to 52-55 lpmm and the decency level hovers around 34-35 lpmm.

Let’s check the results of the tested lens: first its frame centre graph, as shown below.

Tokina AT-X PRO SD 14-20 mm f/2 (IF) DX - Image resolution

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The most important piece of news first: by f/2.8 and f/4.0 across the whole focal range the Tokina reaches truly record levels, with resolution amounting to 55 lpmm. Such a result is worth the best system fixed focus lenses so it should be appreciated especially as the Tokina is a zoom lens. What’s more, equally sensational performance can be seen at the maximum relative aperture. In the 14-17 mm range the lens is able to exceed a very high level of 50 lpmm. Only at 20 mm it couldn’t fare so well but still its results should be considered very good. To sum up the performance of the Tokina 14-20 mm in the frame centre might be described by one word: revelation!

Will the edge of the frame be equally good? Let’s check out!

Tokina AT-X PRO SD 14-20 mm f/2 (IF) DX - Image resolution

You can notice at once there are no reasons to complain. First of all the differences between particular focal lengths are slight; secondly, on stopping down the aperture the MTFs are able to reach a very good level of 45 lpmm. Thirdly, even at the maximum relative aperture the lens’s performance is always at least decent. Taking into account the fact how difficult the parameters of the tested lens are, the optics specialists who took part in designing it really deserve a round of applause. Good job!

At the end of the chapter traditionally we present crops taken from photos of our testing chart saved as JPEG files.

Canon 50D, JPEG, 17 mm, f/2.8
Tokina AT-X PRO SD 14-20 mm f/2 (IF) DX - Image resolution
Canon 50D, JPEG, 20 mm, f/2.0
Tokina AT-X PRO SD 14-20 mm f/2 (IF) DX - Image resolution