@10mm @f8
Got my new sigma 10-20mm and tested with few shooting. A bit disappointed with the vignetting effect cause by the lens. To make myself feel better, i'll take this a very good experience on how to test and evaluate a lens on the vignetting effect.
Below is the test I do on my sigma 10-20mm taken with different aperture and zoom at 10/14/20mm. Look like I only can use the lens at 20mm or aperture > 8.
If you don't understand what is Vignetting, please refer to the link below:
http://toothwalker.org/optics/vignetting.html
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