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17-50mm f/2.8 EX DC OS HSM Zoom Lens for Sigma DSLRs with APS-C Sensors
 
2.0

(based on 1 review)

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Reviewed by 1 customer

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(2 of 9 customers found this review helpful)

 
2.0

Not one of Sigma's best efforts

By Mike

from Oregon

About Me Semi-pro Photographer

Verified Buyer

Pros

  • Fast / accurate auto-focus
  • Sharp at 50mm wide open

Cons

  • Bad OS poor edge sharpne

Best Uses

  • none

Comments about 17-50mm f/2.8 EX DC OS HSM Zoom Lens for Sigma DSLRs with APS-C Sensors:

I bought this lens in hope that I would be able to handhold it at 50mm f4 at 1/25 sec. For me to be able to do this two things were necessary:1. it needed to be sharp at f4 from center to corner and2. the OS had to work well at 1/25 sec.To my great surprise it was actually sharp enough to use at f2.8. But on trying to use the OS I discovered that either it was broken out of the box or the worse designed lens stabilization system ever invented. I'll assume the former for this review because I can't imagine any company, even one as well known as Sigma for cutting corners, that would actually release a design this bad. The OS actually would occasionally work at 1/8, 1/13/, 1/15 and 1/20 sec., but not at any other speed (go figure). At any faster speeds the OS would actually lower the sharpness of the image (one shot I did at 1/640 sec was so bad it looked as if someone shook the camera). So the OS was actually interferring with the sharpness of the lens at higher shutter speeds, which is why I assume I got a lemon.The other thing I wasn't too happy about this lens was that only at 50mm were the corners sharp. At all the other focal lengths the corners didn't become usuable until f11, and by f11 defraction lowers the sharpness in the center.So you can see why I cannot really recommend this lens to anyone. Even if the OS did work correctly the poor corner performance would still render it unacceptable. Only at 50mm is it really any good center to corner.For those who are interested I posted my complete test at infinity here:http://www.pbase.com/mikeearussi/sigma_1750_os_test

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