Sigma 17-70mm f2.8-4 DC Macro OS HSM C Canon review - The Above ‘Standard’ Zoom
By Ben Boswell -
Friday, March 01, 2013
At some point or another nearly every photographer is going to own a ‘standard’ zoom lens. If their camera has an APS-C sensor then it is going to be something like a 17 or 18mm to 55 or 85mm. This Sigma 17-70mm is right in the middle of this range, but that is the only place where it is in the middle. In all other respects it is among the front runners. Of its type the Sigma 17-70 f2.8-4 DC Macro OS HSM C Canon is well priced, well specified and a good performer.
Regarding three versions of Sigma 17-70
I'm a Nikon user, and got my Sigma 17-70/2.8-4.5 (first version) when bought my D300.
I was really happy and amazed of how sharp could be that lens, and even I got the Nikon 16-85 VR only to sell it some time later because I liked way more the microcontrast and clarity of the Sigma.
Then the 17-70 OS version showed up, and being so happy with the first version I bought this OS one. But I was shocked because results weren't so good. Tried three copies, and below 35-50 mm field curvature was really a problem even at f/8: focus on the center and get blurried sides, focus on sides and get blurried center. It was so heavy that I almost couldn't believe it, but I was seeing it... A couple of years ago I could test a new sample from a friend that didn't show that field curvature (???), but anyway results weren't that good, my old 2.8-4.5 was still better on corners closing at f/5.6 than the OS at f/8.
And now here comes this C version, and again I'm quite excited about it. Well, not that much now, because when comparing measurements of the three versions at 17 and 24 mm I can see that the first one still delivers sharp corners, but not so the OS nad C versions.
Can wait for real samples, but I have liked to see something different at the wide end in the corners.
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