Tokina AT-X PRO FX SD 16-28 mm f/2.8 (IF)
10. Autofocus
When it comes to the speed, though, the AF is hardly impressive. Running through the whole distance range and finding the focus takes about one second – it is not a result which would allow the Tokina to compete successfully with its rivals. Mind you the working range of the focus ring is not wide and it could have worked much more efficiently. Anyway the Tamron 15-30 mm sets the focus about two times faster and the 16-35 mm lenses produced by Canon can even beat that.
When it comes to the accuracy it would be difficult to have any reservations - the number of misses in studio conditions didn’t exceed 4%. Still we have an impression that the significant depth of field of the tested lens helps the autofocus in a significant way – after all only 50% of all hits were spot-on.
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While cooperating with the EOS 50D camera the Tokina had a slight back-focus; it could be corrected without problems by the microcalibration. Still, while attached to the full frame EOS 5D Mark III, the lens had no problems whatsoever – no matter what focal length or what distance from the aim we set, the focus was always set where it should be.
| Canon 50D, 26 mm, f/2.8 |
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| Canon 5D III, 28 mm, f/2.8 |
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