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Lens review

Yongnuo YN 50 mm f/1.8

26 January 2015
Szymon Starczewski

10. Autofocus

The Yongnuo YN 50 mm f/1.8, like the Canon, doesn’t have any ultrasonic motor. It is of course rather audible – the lens is even louder than the Canon although their speeds seem to be similar; ok, maybe the Canon was a tad faster. Running through the whole range, covered by 80-degree or so turn of the ring, takes the tested lens about 0.6-0.7 of a second. The Canon was 0.1-0.2 of a second faster.

What’s interesting, the accuracy of the Yongnuo seems to be actually better. First of all we didn’t notice any of autofocus back-and-forth play, so notorious in the Canon. What’s more, the number of misses didn’t exceed 10% - a quite decent result for such a cheap lens.

The situation with front and back focus tendencies was also looking nicer in the case of the Yongnuo. While working on both bodies the lens had a slight front-focus but still even at the minimum focusing distance the depth of field included the photographed object. In practice we didn’t have to calibrate the bodies to make the lens hit where we wanted it to.

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50D, f/1.8
Yongnuo YN 50 mm f/1.8 - Autofocus
5D MkIII, f/1.8
Yongnuo YN 50 mm f/1.8 - Autofocus