Tokina AT-X PRO SD 14-20 mm f/2 (IF) DX
4. Image resolution
Let’s check the results of the tested lens: first its frame centre graph, as shown below.
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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!
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 |
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| Canon 50D, JPEG, 20 mm, f/2.0 |
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