Canon EF-S 18-135 mm f/3.5-5.6 IS STM
10. Autofocus
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The tested lens boasts an STM autofocus motor so its work during the focusing is completely noiseless. Still it can hardly be called a speed demon because running through the whole distance scale and confirmation of the focus takes about 0.8-0.9 of a second. We’ve seen much faster mechanisms based on the same technology.
Still you shouldn’t carp about the accuracy. The lens misfocuses sporadically and such cases never exceed 2% of the whole number of photos. The lens didn’t need to be micro-calibrated with front or back focus in mind either.
| 50D, 85 mm, f/5.6 |
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| 50D, 135 mm, f/5.6 |
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