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Which Sigma?
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<blockquote data-quote="Horoscope Fish" data-source="post: 534604" data-attributes="member: 13090"><p>I don't really know that one of them is better than the other...</p><p></p><p>What would you say is more important or more desirable to you: a constant f/2.8 aperture or the extra 20mm of focal length?</p><p></p><p>Both lenses are reasonably sharp wide open across their focal length (some reviews have complained about the 17-70mm being soft at 17mm, but I've seen plenty of examples showing otherwise). Both lenses are 1-2 stops faster than the usual f/3.5-5.6 kit-lens and both offer great image quality. Some people want the extra range of the 17-70mm, some people want a constant f/2.8 aperture. Personally, I'm big on constant aperture lenses: I simply prefer them.</p></blockquote><p></p>
[QUOTE="Horoscope Fish, post: 534604, member: 13090"] I don't really know that one of them is better than the other... What would you say is more important or more desirable to you: a constant f/2.8 aperture or the extra 20mm of focal length? Both lenses are reasonably sharp wide open across their focal length (some reviews have complained about the 17-70mm being soft at 17mm, but I've seen plenty of examples showing otherwise). Both lenses are 1-2 stops faster than the usual f/3.5-5.6 kit-lens and both offer great image quality. Some people want the extra range of the 17-70mm, some people want a constant f/2.8 aperture. Personally, I'm big on constant aperture lenses: I simply prefer them. [/QUOTE]
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