Sigma AF 18-125mm f/3.8-5.6 DC HSM OS (Canon) - Review / Test Report - Sample Images & Verdict
Lens Reviews - Canon EOS (APS-C)

Sample Images

Here're a couple of sample images taken with the EOS 50D and RAW-converted via CaptureOne v4.5.

Click on a thumbnail to view the original file (opens in a separate window). Please note that the originals are FULL SIZE samples (=several megabytes) thus requiring a significant amount of bandwidth so please take care of the limited resources here.

Make Canon
Model Canon EOS 50D
ISO Speed 200
Focal Length 125.0mm
Exposure Data: f/11.0 @ 1/25s
Size 4752x3168
Make Canon
Model Canon EOS 50D
ISO Speed 200
Focal Length 28.0mm
Exposure Data: f/9.0 @ 1/400s
Size 4752x3168
Make Canon
Model Canon EOS 50D
ISO Speed 200
Focal Length 125.0mm
Exposure Data: f/5.6 @ 1/200s
Size 4752x3168
Make Canon
Model Canon EOS 50D
ISO Speed 200
Focal Length 125.0mm
Exposure Data: f/5.6 @ 1/500s
Size 4752x3168
Make Canon
Model Canon EOS 50D
ISO Speed 200
Focal Length 97.0mm
Exposure Data: f/10.0 @ 1/250s
Size 4752x3168
Make Canon
Model Canon EOS 50D
ISO Speed 200
Focal Length 41.0mm
Exposure Data: f/10.0 @ 1/125s
Size 4752x3168
Make Canon
Model Canon EOS 50D
ISO Speed 200
Focal Length 125.0mm
Exposure Data: f/10.0 @ 1/250s
Size 4752x3168
Make Canon
Model Canon EOS 50D
ISO Speed 200
Focal Length 18.0mm
Exposure Data: f/10.0 @ 1/160s
Size 4752x3168

Verdict

The Sigma AF 18-125mm f/3.8-5.6 DC HSM OS is an interesting lens with a couple of high and lows which is quite typical for such extreme zoom range lenses. The resolution characteristic is generally decent - only the soft borders at 125mm may be really objectionable. The vignetting could be better at 18mm and 125mm at max. aperture but frankly that's also nothing out of the ordinary in this class. Distortions as well as CAs are comparatively well controlled.
The build quality is on a very high level although the rather odd non-OS mode implementation is a bit of a faux-pas here. The AF performance is nothing special nor bad either. The OS (Optical Stabilizer) can give you a couple of extra f-stops in extreme situations but don't expect wonders - the specified gain of up to 4-stops is unlikely in field conditions. All-in-all a sound package when taking the competitive pricing into account.

Optical Quality:    
Mechanical Quality:
Price/Performance:
      
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