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10-13-2010, 09:27 PM   #1
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Sigma 17-50mm F2.8 EX DC OS HSM ?

I'm a little confused on the Sigma's, they have a couple of versions in the 17-50 , 18-50 range.
I'm looking for the very best repacement I could find for my Kx's 18-55 kit lens.

Which of these Sigma models has the best IQ?

17-50mm F2.8 EX DC OS HSM

18-50mm F2.8 EX DC Macro

18-50mm F2.8 EX DC Macro HSM

10-13-2010, 11:19 PM   #2
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The 18-50's were a good lens but from what I have read & images I have seen, the 17-50, which is the newest version, is the pick of the bunch. It has improved lens elements and coatings and produces better images.
10-14-2010, 08:18 AM   #3
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Note also that there is no 18-50mm F2.8 EX DC Macro HSM for Pentax mount. The HSM version of the 18-50mm was only ever available in Nikon Mount.
10-14-2010, 02:35 PM   #4
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If you only want to replace the kit lens; Sigma 17-70mm f/2.8-4.5 is also a viable alternative. It has better IQ (than the kit lens), it is versatile and it is more affordable than the fixed aperture offerings.


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