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Old Oct 6, 2007, 11:51 PM   #1
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I am about to order the 40D in a kit combined with the Canon ZoomEF 28-135mm f/3.5-5.6 IS. Does anyone have this set-up? If not the 40D, the 30D or even 20D? I am curious to the quality of this lens. I also saw in Popular Photography they reviewed the new Sigma lens mentioned above in subject line (28-200mm OS). Does anyone own that lens? I am debating between the two lenses. Any info you could give me, even if it's heresay or reviews I would greatly appreciate it, being that I have to place the order first thing in the morning (I am changing an previously made order). BTW, I put this post in the Canon EOS Lens section as well, but people don't seem to read that forum as much and I really need some info. Thanx in advance!
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Old Oct 6, 2007, 11:53 PM   #2
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The Sigma Lens is actually a 18-200mm OS lens, not 28 as in my first post. It was my error, sorry
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Old Oct 7, 2007, 9:28 AM   #3
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Photozone have reviewed both lenses over here:
http://www.photozone.de/8Reviews/len...63os/index.htm
http://www.photozone.de/8Reviews/len...6_is/index.htm

It's really two different lenses with the Sigma spanning quite a larger range than the Canon. As expected the distortion numbers are worse on the Sigma, but it's sharpness seems to be quite good as compared to the EF 28-135. This is probably due to the Sigma's digital only design which tends to have a better contrast (hence MTF's) than the full-frame Canon... Especially in the center where the Sigma seems to well exceed the Canon @ every focal lenghts!

The Canon have the USM however which the Sigma doesn't so the speed of the AF is probably less and you won't get the full time AF manual overide. The Sigma is probably more flexible as a 1-lens all around solution if that's what you're after...

I already have the EF 28-135 so I'm more inclined to get the Sigma to try though!
BTW even though the distortion looks worse than the EF, the Sigma still control this number better than the Nikon's 18-200 version which is what this lens should be compared to (Don't compare the MTF's because the lenses are shots on two different bodies here - i.e. Canon's MTF are always lower than Nikon's due to the way they tested)
FYI - http://www.pbase.com/lightrules/sigma18200os
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Old Oct 7, 2007, 8:22 PM   #4
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thanks, NHL. I appreciate it. I am thinking of getting the Canon 28-300mm L lens for the spring and summer, when I mostly shoot outdoors. From What I read, it is an incredible lens. The 28-135 is a good range, and B&H is selling it for $300 less in the kit, so for $200, I think the lens is worth having. I could always sell it on e-bay for at least what I got it for. Also I have that 70-300mm IS DO lens, and it isn't really that good (this is why I want to get that L lens). Also, I find myself wanting to zoom out below 70mm, and I can't with that lens, but I can with the L, so it seems like a better choice. It looks like a monster, though, and it is grey, which I am not crazy about, but getting used to.
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