LensTip.com

Recommended

Lens review

Sigma A 135 mm f/1.8 DG HSM

14 April 2017
Print Share
Maciej Lata³³o

10. Autofocus

As its name indicates, the Sigma A 135 mm f/1.8 DG HSM was equipped with an ultrasonic autofocus motor called the Hyper Sonic Motor by the producer. The mechanism is practically noiseless. Still running through the whole distance range and confirming the focus takes about 0.8-0.9 of a second, nothing impressive. That time can be shortened to about 0.4 of a second after choosing a range from 1.5 meters to infinity among the positions available in the AF limiter.

In studio conditions, where we use mainly the central autofocus point, there were almost no problems with the accuracy of the mechanism, with the number of misses never exceeding 2%. Sample shots outside were a bit a different story as I used side points of autofocus quite often. I didn’t notice any big mistakes but, with a shallow depth of field by f/1.8-2.0, even a small slip-up might be annoying. From f/2.8 upwards everything returned to norm.

As you see in photos below the Sigma didn’t have the slightest problems with any front or back focus tendencies, no matter what body we used in our test.

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

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

Canon 50D, f/1.8
Sigma A 135 mm f/1.8 DG HSM - Autofocus
Canon 5D MkIII, f/1.8
Sigma A 135 mm f/1.8 DG HSM - Autofocus




Latest reviews

Latest articles

Most read

Latest owners opinions

Copyrights ©2006-2019 CO-NET Robert Olech.
 Strona wygenerowana w 0.079 sek.
This site is not responsible for any damage that the information on this site may cause to your system. It is illegal to copy or redistribute any information found on this site in any way without the expressed written consent of CO-NET Robert Olech
Wydawc LensTip.com jest firma CO-NET Robert Olech. Adres wydawcy oraz redakcji: ul. wirki i Wigury 11/34 83-000 Pruszcz Gdaski

The LensTip.com website uses cookies which are saved on your computer. We employ that technology for functional, statistical and marketing reasons. Cookies allow us to monitor the users' actions on a given page, target the marketing content with a greater accuracy and generally make the interaction between the website and our Visitors easier and faster e.g. by allowing you to log in automatically. Cookies can also be used by our advertisers and the Google Analytics tool which gathers statistical data. If you visit Optyczne.pl and your browser accepts the cookies we assume that you agree with our policy and have nothing against saving them in the memory of your device. If you find it too intrusive you can always change the settings to block cookies. Go here to find out how to set up your browser in order to accept or block cookies and more.