How good is Sigma 8-16mm?

Started Jan 20, 2012 | Discussions thread
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Kesha
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How good is Sigma 8-16mm?
Jan 20, 2012

I need a ultra wide lens for my IR photography, this lens will be used for model shot with landscape.
I found Sigma 8-16mm is very interesting.

Is that any special good and bad opinions for this lens?
How good the sharpness at 8mm?
How good the contrast?
What is its best focal length for sharpness?
How about the color tones?

thanks.

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 Kesha's gear list:Kesha's gear list
Sigma 8-16mm F4.5-5.6 DC HSM
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