Lens review

Tokina AT-X PRO FX SD 70-200 f/4 VCM-S

16 September 2014
Arkadiusz Olech

4. Image resolution

The resolution test of the Tokina AT-X PRO FX SD 70–200 f/4 VCM-S was based on RAW files from the Nikon D3x camera. The decency level is situated around 30-32 lpmm and the best fixed-focus lenses get results as high as 47-49 lpmm, with the record belonging to the Zeiss Otus 1.4/55 which, by f/4.0, managed to exceed slightly 50 lpmm. It is worth mentioning also the excellent result of the Zeiss Apo Sonnar T* 135 mm f/2.0 which was able to reach close to 49 lpmm.

The results of the Tokina are easily comparable to the results of the Nikkor AF-S 70–200 mm f/4.0G ED VR, which was tested on the same body. Let’s just remind here that the best value in the frame centre, amounting to about 44 lpmm, it got by f/5.6 at 70 and 135 focal lengths; it fared the weakest when wide open at 200 mm with the MTFs amounting to just 35 lpmm.

The comparison with the Canon EF 70–200 mm f/4L IS USM is going to be a bit trickier – we tested it in 2007 on an 8-megapixel sensor of the Canon 20D and the MTFs you get are about 1-2 lpmm lower than those produced by the D3x sensor. The peak of its possibilities the Canon 70-200 mm f/4.0 IS got in the range from 135 to 200 mm by f/5.6-8.0, reaching almost 42 lpmm. Taking into account the difference in the sensor densities these results are almost the same as the results of the Nikkor 70-200 f/4.0 VR. What differs them is the weakest focal length: in the case of the Canon it was the 70 mm in the case of the Nikkor - 200 mm.

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Let’s check how the tested Tokina compares here – its results in the frame centre are presented on a graph below.

Tokina AT-X PRO FX SD 70-200 f/4 VCM-S - Image resolution

First thing worth your attention is an even performance across the focal range. The differences are really slight; the 200 mm focal length fares just a tad worse than the other ones. The second important thing is the fully useful image, being produced already from the maximum relative aperture – at every focal length the MTFs amount to 34-36 lpmm. Also a good image quality near f/8.0, where the lens reaches a peak of its possibilities exceeding slightly a level of 40 lpmm, is an important feature.

The results are really very good and everything would be just perfect if not for the rivals. Both stabilized Canon and Nikon lenses with the same parameters as the tested Tokina fare a bit better. The only lens the Tokina can compete with successfully is the older Canon EF 70-200 f/4L USM, without any stabilization. Still the price tag of the tested lens might remain a problem – even though its performance is similar and it is stabilized it is also almost two times more expensive than its older rival.

Now let’s check the situation on the edge of the APS-C sensor.

Tokina AT-X PRO FX SD 70-200 f/4 VCM-S - Image resolution

The performance is no longer as even as in the frame centre - you can notice that the 70 mm focal length fares the best and the 200 mm is the worst. Still you should emphasize the fact that the lens reaches a level of about 30 lpmm already at the maximum relative aperture so the images it produces are useful – no reasons to complain here.

However the stabilized Canon and Nikon lenses fared better – their advantage is especially visible by f/4.0 and f/5.6. Once again only the older Canon 70-200 mm can be beaten by the tested Tokina.

Now let’s progress to the edge of the full frame sensor and see how the Tokina performs there.

Tokina AT-X PRO FX SD 70-200 f/4 VCM-S - Image resolution

You can see differences between particular focal lengths but this time they are distinct near f/8-f/16 and almost evened out near the maximum relative aperture, with the MTFs keeping a level of 28-29 lpmm no matter what focal length you apply. It is a tad below the decency level threshold but very close to it - some users might consider the images fully useful.

What’s more, the performance on the very edge of full frame is a category in which the Tokina can successfully compete with its rivals. Its maximum MTFs and the results at 200 mm and by f/4.0 are higher than those of the Nikkor 70-200 mm VR so the tested lens should be praised.

At the end we present crops taken from photos of our resolution testing chart; the photos were saved as JPEG files along with RAW files, used for generating all the graphs above.

Tokina AT-X PRO FX SD 70-200 f/4 VCM-S - Image resolution