How do I test the quality of my sigma 10-20?

Started Jul 19, 2011 | Discussions thread
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ashegam
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How do I test the quality of my sigma 10-20?
Jul 19, 2011

I just purchased a Sigma 10-20mm F4-5.6 EX DC HSM Pentax Lens. Having read a little about it, quality control seems to be a known issue with these lenses.

Most ownders recommend taking pics at f8 to f11 and then to look for blared images etc..

As a amateur who doesn't know much about photography, how else can I tell if I a received a good lens or a lower quality one?

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