Finally some image samples taken with the EOS 50D and RAW converted via DPP.
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Make
Canon
Model
Canon EOS 50D
ISO Speed
200
Focal Length
31.0mm
Aperture:
f/8.0
Exposure
1/640s
Make
Canon
Model
Canon EOS 50D
ISO Speed
200
Focal Length
17.0mm
Aperture:
f/9.0
Exposure
1/500s
Make
Canon
Model
Canon EOS 50D
ISO Speed
200
Focal Length
55.0mm
Aperture:
f/6.3
Exposure
1/1250s
Make
Canon
Model
Canon EOS 50D
ISO Speed
200
Focal Length
28.0mm
Aperture:
f/8.0
Exposure
1/640s
Make
Canon
Model
Canon EOS 50D
ISO Speed
200
Focal Length
55.0mm
Aperture:
f/2.8
Exposure
1/3200s
Make
Canon
Model
Canon EOS 50D
ISO Speed
200
Focal Length
55.0mm
Aperture:
f/2.8
Exposure
1/3200s
Make
Canon
Model
Canon EOS 50D
ISO Speed
200
Focal Length
55.0mm
Aperture:
f/2.8
Exposure
1/1000s
Make
Canon
Model
Canon EOS 50D
ISO Speed
200
Focal Length
17.0mm
Aperture:
f/8.0
Exposure
1/800s
Make
Canon
Model
Canon EOS 50D
ISO Speed
200
Focal Length
21.0mm
Aperture:
f/9.0
Exposure
1/800s
Make
Canon
Model
Canon EOS 50D
ISO Speed
200
Focal Length
55.0mm
Aperture:
f/9.0
Exposure
1/1000s
Make
Canon
Model
Canon EOS 50D
ISO Speed
200
Focal Length
55.0mm
Aperture:
f/8.0
Exposure
1/1250s
Verdict
The Canon EF-S 17-55mm f/2.8 USM IS is not a perfect lens but it lives quite well up to the very high expectations of the user base. The resolution figures are among the very best for an APS-C standard zoom lens. The center resolution is generally excellent even on the EOS 50D and the borders can keep a very good quality level. The distortion characteristic is quite typical for a zoom lens in this range (relatively pronounced barrel distortion @ 17mm, moderate pincushion distortion @ 55mm) whereas lateral CAs are unusually moderate. Unfortunately vignetting can be an issue at f/2.8 and the quality of the bokeh (rendering of the out-of-focus blur) lacks greatness in critical situations. The build quality of the lens is pretty good but in relation to its price tag Canon should have used a little less plastic - finally even the much cheaper EF 70-200mm f/4 USM L features a magnesium-alloy shell. All-in-all the EF-S 17-55mm f/2.8 USM IS is clearly a level up from the other Canon standard zoom lenses albeit a pricey one.
