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The corners are soft at f/2.8 with the 50mm corners looking the best. With 50mm showing very slightly reduced sharpness.
With a wide open f/2.8 aperture, the Sigma 17-50mm f/2.8 EX DC OS HSM Lens is impressively sharp in the center throughout the focal length range The Sigma 17-50mm f/2.8 EX DC OS HSM Lens is shown mounted on a Canon EOS 60D above. I have a couple of sharp images made at 50mm and 1/5 sec, but the keeper rate is very low. This is, again, a net 3-stops of assistance from OS. 8 seconds, but the keeper rate is very, very low at these exposure durations.Īt 50mm, 1/10 or 1/8 seems to be my shutter speed limit for sharp images. and in other situations where holding a camera steady is difficult and a tripod is not being used.Īt 17mm, I am getting a good rate of sharp images from the Sigma 17-50mm f/2.8 EX DC OS HSM Lens at 1/4 sec exposures for a net 3-stops of assistance from OS. In the wind, on unstable footing, on a boat. If your subject is not moving, the Sigma 17-50's 4-stop-rated OS (optical stabilization) will be a great help in achieving sharp handheld shots in low light, (a wider aperture results in a shallower depth of field - all other factors remaining equal).Īt 17mm, you are going to need a close subject to generate any significant background blur at 17mm f/2.8,īut, at 50mm, blurring the background becomes an easier accomplishment. Use the wide aperture to stop action (or camera motion) in low light by allowing a faster/shorter shutting speed and/or to blur the background. There are, however, many 17 to 50mm (or 55mm) f/2.8 lenses available from other manufacturers - I'll reference some of these later in this review.Īs I indicated already, a wide aperture is a great advantage for a lens to have. The longer focal length lenses frequently sacrifice image quality to obtain their range and most do not offer the fixed f/2.8 max aperture across the entire range. There are many lenses with longer focal length ranges available.
This aperture difference can translate into a big difference in your image quality. To the sensor (2 stops) as most kit lenses offer at their longest focal length (f/5.6). The Sigma 17-50 OS' fixed f/2.8 max aperture across the entire focal length range provides 4x as much light If there is any subject movement, the max aperture available on these lenses is not wide enough to allow the action to be stopped - resulting in motion-blurred images. While the kit lens is very economical, it is also the source of many emails I receive - especially when being used indoors without a flash.
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It works great for around-the-house shots (inside and out), for landscapes, for full body and head-and-shoulders portraits, for close sportsįor many, their first general purpose lens is the one available in-the-box with their first DSLR. My field work for the Sigma 17-50mm f/2.8 EX DC OS HSM Lens review was done in early spring.Īfter a long, cold winter, the bright new growth on the trees was looking gorgeous to me.
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