Is the Sigma 18-50mm f2.8-4.5 the best zoom lens for Sony Alpha around 200$?

Started Apr 25, 2012 | Discussions thread
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dandoro
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Is the Sigma 18-50mm f2.8-4.5 the best zoom lens for Sony Alpha around 200$?
Apr 25, 2012

http://www.bhphotovideo.com/c/product/622374-
REG/Sigma_861205_18_50mm_f_2_8_4_5_DC_OS.html

Is this lens the best choice in the 150-250$ range? I want to buy the best zoom lens for my A57, but within this small budget. Is it better than the 18-55 Sony kit lens? Do you have other lens to recommend beside this one?

The fact this lens has built in stabilization has any impact on the stabilization, in general, taking into account that the A57 already have a built in stabilization..?

And does the AF function with this lens? Is it less louder due to HSM technology or not?

Sony SLT-A57
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