Canon EF 200 mm f/2.0L IS USM review - Autofocus

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Canon EF 200 mm f/2.0L IS USM

16 August 2012

Arkadiusz Olech

10. Autofocus

The tested lens boasts an ultrasonic USM motor so its work is noiseless. Running through the whole scale without limiting its range takes about one second - you don’t deal here with a speed which can be called exceptional. Fortunately there is a focus limiter here and after using it the focusing time decreases to just over half of a second.

After using the original 1.4x Canon converter the autofocus speed seems to remain the same. If there is any slowing down it is imperceptible, not exceeding 01-0.2 of a second.

Theoretically the tested lens has a really shallow depth of field so any potential mistakes of the focusing mechanism should be easy to notice. It is just a theory, though; in practice there are no visible mistakes. The number of misses the lens had in studio conditions didn’t exceed the level of 1% - a really excellent result.

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The cooperation with the teleconverter is also seamless – the autofocus didn’t miss almost at all. When it comes to the front or back focus tendency the lens set the focus a bit behind the target on both bodies, used in our test. When we took photos from greater distances that tendency wasn’t noticeable; you could perceive it only at the minimum focusing distance. What’s interesting, that back-focus disappeared after attaching the brand name teleconverter to the lens.