Olympus Zuiko Digital 9-18 mm f/4-5.6 ED
10. Autofocus
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Although the lens doesn’t have an ultrasonic SWD motor, the autofocus work is difficult to fault. While focusing, the Olympus 9-18 mm just buzzes quietly; the whole process is very efficient and quick. There were virtually no errors (0%) in the studio – the result is excellent but it can be explained by this lens’s parameters. In many situations the immense depth of field made the autofocus simply redundant. For instance at 9 mm and by maximum relative aperture f/4.0 we focus for 1.4 meters and we have a sharp picture from 0.7 meter to infinity! It’s a bit worse for 18 mm and at maximum aperture f/5.6 – to get a good result and a sharp range from 2 metres to infinity you have to set the focus for 3.9 meters.
The lens didn’t have any problems concerning backfocus or frontfocus either.
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