Sigma AF 18-200mm f/3.5-6.3 DC OS (Canon) - Review / Test Report - Sample Images & Verdict
Lens Reviews - Canon EOS (APS-C)

Sample Images

Here're a couple of quick'n dirty sample images taken with the EOS 350D and RAW-converted via RSP 2006.

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 350D DIGITAL
ISO Speed 200
Focal Length 78.0mm
Exposure Data: f/5.6 @ 1/500s
Size 2311x3471
Make Canon
Model Canon EOS 350D DIGITAL
ISO Speed 100
Focal Length 200.0mm
Exposure Data: f/6.3 @ 1/800s
Size 2311x3471
Make Canon
Model Canon EOS 350D DIGITAL
ISO Speed 100
Focal Length 18.0mm
Exposure Data: f/11.0 @ 1/100s
Size 2311x3471
Make Canon
Model Canon EOS 350D DIGITAL
ISO Speed 100
Focal Length 35.0mm
Exposure Data: f/4.5 @ 1/1000s
Size 3471x2311
Make Canon
Model Canon EOS 350D DIGITAL
ISO Speed 100
Focal Length 35.0mm
Exposure Data: f/11.0 @ 1/100s
Size 2311x3471
Make Canon
Model Canon EOS 350D DIGITAL
ISO Speed 100
Focal Length 115.0mm
Exposure Data: f/11.0 @ 1/200s
Size 3471x2311
Make Canon
Model Canon EOS 350D DIGITAL
ISO Speed 100
Focal Length 96.0mm
Exposure Data: f/5.6 @ 1/320s
Size 3471x2311
Make Canon
Model Canon EOS 350D DIGITAL
ISO Speed 100
Focal Length 134.0mm
Exposure Data: f/5.6 @ 1/800s
Size 2311x3471

Verdict

The Sigma AF 18-200mm f/3.5-6.3 DC OS is an extremely versatile lens but performance-wise it is a bit of a mixed bag. The resolution characteristic varies significantly throughout its immense zoom range. Interestingly the extreme ends are actually the sweet spots of the lens whereas the 35mm setting is downright miserable at large apertures. The quality recovers at 50mm before dropping somewhat at 100mm again. To be fair the lens is capable to provide a decent quality if you avoid large aperture settings and stick to ~f/9 regardless of the zoom position. On the positive side vignetting and CAs are quite well controlled and distortions may be a problem at 18mm only. The quality of the bokeh (out-of-focus blur) is sometimes less than stellar though. The AF speed and accuracy is pretty fine and the image stabilizer can give you an advantage equivalent to about 3 f-stops in field conditions. The build quality of the Sigma is surprisingly good and above average for a lens in this class.

Optical Quality:    
Mechanical Quality:
Price/Performance:
      
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