Used Sigma vs updated one - help!

Started Feb 1, 2014 | Questions thread
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pentaxk5iis New Member • Posts: 3
Used Sigma vs updated one - help!

Hi - I'm sorry if this has been asked before!  I hope someone can help me.

I have the opportunity to buy a used Sigma 17-70 DC lens for $249.  It is NOT HSM.  What is the difference between the two lenses in terms of image quality?  I can't seem to find a comparison out there.

Thank you in advance!!

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