Sigma AF 10-20mm f/4-5.6 EX DC (Pentax K) - Review / Test Report - Sample Images & Verdict
Lens Reviews - Pentax

Sample Images

Here're some quick'n dirty sample images taken with the K10D and RAW-converted via ACR. Sorry for the bad quality but the weather conditions were rather mediocre at the time with only a few short moments of sunshine.

Click on a thumbnail to view the original file (opens in a separate window). Please note that the originals are FULL SIZE (=several megabytes) which requires quite some bandwidth for downloading so please don't waste the limited resources here.

Make PENTAX Corporation
Model PENTAX K10D
ISO Speed 200
Focal Length 20.0mm
Exposure Data: f/9.0 @ 1/160s
Size 3805x2547
Make PENTAX Corporation
Model PENTAX K10D
ISO Speed 200
Focal Length 10.0mm
Exposure Data: f/9.0 @ 1/200s
Size 2592x3872
Make PENTAX Corporation
Model PENTAX K10D
ISO Speed 200
Focal Length 10.0mm
Exposure Data: f/5.6 @ 1/20s
Size 2592x3872
Make PENTAX Corporation
Model PENTAX K10D
ISO Speed 200
Focal Length 20.0mm
Exposure Data: f/5.6 @ 1/13s
Size 3872x2592

Verdict

The Sigma AF 10-20mm f/4-5.6 EX DC showed an pretty impressive performance with a few bugs. The resolution characteristic is generally very good to excellent except in the extreme corners at 10mm which are a bit soft at large aperture settings. A weak aspect of the Sigma is very high vignetting at large apertures - to be fair this is relatively normal regarding the extreme ultra-wide focal-length range. The CA characteristic (color shadows at the image borders) is generally pretty good except in the extreme corners at 10mm. The build quality of the lens is very high and leaves nothing to be desired. All in all a good alternative to the native Pentax lens.

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