LensTip.com

Lens review

Sony DT 50 mm f/1.8 SAM

20 May 2009
Arkadiusz Olech

10. Autofocus

New Sony lenses have been equipped with SAM (Smooth Autofocus Motor). This motor is built in the lens, not based on ultrasounds, but thanks to it autofocus is supposed to work faster and more accurately.

The autofocus of Sony DT 50mm f/1.8 SAM works quite loudly – we can hear distinct buzzing sound. In regard to speed, it’s hard to accuse it of anything. It runs through the scale, whichever direction, in approximately 0.7 second. And, as the range here is wider than with its competitors, we don’t complain at all.

It’s slightly worse with accuracy, but cheap prime 50s of competitors don’t belong to the most accurate lenses either. On average, it resulted in 14% misses in studio conditions, being little better than Nikkor and noticeable better than Canon.

- - - - - - - - - - - - - - - - - advertisement - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

We also haven’t notice any tendency of front- or back-focusing.


Sony DT 50 mm f/1.8 SAM - Autofocus