I would disagree here, almost every review I have read fits my experience. The Sigma is one fine lens. Much sharper than the pentax, although the edges are a bit soft till you stop down. The only reason I see for choosing the Pentax over this is flare protection. Weigh this up against the wider range and aperture and its a tough choce though...
If you look on http://www.photodo.com/nav/prodindex.html you will see the 20-35 slightly ahead, but the Pentax 17-35 behind. You will notice also that the Tokina 20-35 2.8 is lower still, behind even the 'non-pro' tokina 3.5! Check out the reviews on www.photographyreview.com , but with Sigma bear in mind that some people just plain dont want to like the company either because of older experiences with cheap consumer lenses or personal bias due to the name (bit like Skoda - nice cars now, but do you want to be seen with one?). Still this lens gets great reviews... > -----Original Message----- > From: Mark Roberts [mailto:[EMAIL PROTECTED]] > Sent: 06 March 2002 14:30 > To: [EMAIL PROTECTED] > Subject: Re: FA 20 - 35 and 17-35 DOF > > > MPozzi wrote:> > > >No have not really considered the Sigma EX 17-35 > >f2.8-4 > >because I had seen some tests done with it and they > >did not really shine compered to the ones mentioned > >below. They were the users feedback from the photozone > >site, and MTF tests done on one of the magazines. > > Ah, glad to hear it! I didn't *want* to want this lens > (mainly because of > the filter size) so I'm pleased to learn it isn't very good. > > >Unluckily, I haven't seen any actual pictures taken by > >that lens. > >I have 2 sigma ex and very happy with those, but the > >shortlis made below purposely left that sigma out in > >favour of its newer constant wide angle, the value for > >money and build quality of the Tokina and, well, > >Pentax �cos its Pentax! > > Now if only Pentax would make a 17-35 (rectilinear) zoom... > > > -- > Mark Roberts > www.robertstech.com > - > This message is from the Pentax-Discuss Mail List. To unsubscribe, > go to http://www.pdml.net and follow the directions. Don't forget to > visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .

