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Old Aug 23, 2006, 2:50 AM   #1
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hi guys, i never bought that Canon 18-70....financial woes. I have been using a friend's 18-55 kit lens for the last month, and now want to buy a lens for my camera.

Can only afford sigma 17-70, or sigma 18-200. That price range will have to do for now.

I see the 17-70 is faster, and has an almost-macro function!

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Old Aug 23, 2006, 12:11 PM   #2
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I don't have the spec. on 18-200mm, but Iordered a Sigma 17-70mm f/2.8 for my Canon 30D, knowing that this lens won't fit the 5D, but when time come for the upgrade, I would sell the camera & the lens anyway. From my research, I've read many good feedback on this 17-70mm lens, some even say that it's better than the Canon 17-85mm. If I have extra $$$$, I would go with Canon 70-200mm IS instead of Sigma 18-200mm, but that's another story :-)
Anyway. it's depended on whether you just wanted one all-around lens, but I guessed the 18-200mm would be quite a load to carry around.

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Old Aug 23, 2006, 1:46 PM   #3
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Quanvu wrote:
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I don't have the spec. on 18-200mm, but Iordered a Sigma 17-70mm f/2.8 for my Canon 30D, knowing that this lens won't fit the 5D, but when time come for the upgrade, I would sell the camera & the lens anyway. From my research, I've read many good feedback on this 17-70mm lens, some even say that it's better than the Canon 17-85mm. If I have extra $$$$, I would go with Canon 70-200mm IS instead of Sigma 18-200mm, but that's another story :-)
Anyway. it's depended on whether you just wanted one all-around lens, but I guessed the 18-200mm would be quite a load to carry around.

QV
I would'nt say it's better than the 17-85 in what way...
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Old Aug 23, 2006, 5:45 PM   #4
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The Sigma 18 - 200 is quite small when stored at the wide angle setting.
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Old Aug 24, 2006, 1:44 AM   #5
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hercules wrote:
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I would'nt say it's better than the 17-85 in what way...
In more ways than one (IS is not everything...)
1. Less distortion @ the WA (i.e. 17mm)
2. Vignette less
3. Better CA
-> The canon is slighly sharper @ WA , but the Sigma is superior at the Tele! http://www.photozone.de/8Reviews/len...6_is/index.htm
http://www.photozone.de/8Reviews/len...2845/index.htm

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Old Aug 24, 2006, 6:45 AM   #6
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NHL wrote:
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hercules wrote:
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I would'nt say it's better than the 17-85 in what way...
In more ways than one (IS is not everything...)
1. Less distortion @ the WA (i.e. 17mm)
2. Vignette less
3. Better CA
-> The canon is slighly sharper @ WA , but the Sigma is superior at the Tele! http://www.photozone.de/8Reviews/len...6_is/index.htm
http://www.photozone.de/8Reviews/len...2845/index.htm
Well opinions vary,,, but i don't think so, take a look here as well. http://www.pbase.com/lightrules/17701785
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Old Aug 24, 2006, 9:42 PM   #7
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hercules wrote:
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Well opinions vary,,, but i don't think so, take a look here as well. http://www.pbase.com/lightrules/17701785
The Photozone data are not opinion, but actual results (with actual numbers) from Image Test

Your link is an opinion with just sample images...
which do not contain any CA measurements, vignetting info or the higher distortion at 17mm

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Old Aug 25, 2006, 1:22 AM   #8
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NHL wrote:
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hercules wrote:
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Well opinions vary,,, but i don't think so, take a look here as well. http://www.pbase.com/lightrules/17701785
The Photozone data are not opinion, but actual results (with actual numbers) from Image Test

Your link is an opinion with just sample images...
which do not contain any CA measurements, vignetting info or the higher distortion at 17mm
They are both good lenses and so whatifthe 17-85 has a little more distortion, CA, the sigma has them too, and as i recall on photozone he actually preferred the 17-85 over the 17-40 lense.
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Old Aug 25, 2006, 9:22 AM   #9
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hercules wrote:
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They are both good lenses and so whatifthe 17-85 has a little more distortion, CA, the sigma has them too, and as i recall on photozone he actually preferred the 17-85 over the 17-40 lense.
Isn't that just a subjective opinion though?
You can say the same thing about the Sigma - So what if it doen't have IS (since you can rest the camera down for low-light lanscape) or USM as long as the Sigma performs better optically at a lower cost

As to the 17-40 unless you have a full-frame, a 'digital' lens only (even from 3rd parties) tends to outperforms the L in general in term of contrast and sharpness. That's just the nature of their design as the images they projected are more perpendicularly to the sensor plane as oppose to lenses that were designed for film which strike the sensor at more acute angles.

-> The 17-40L was the only game in town initially - but nowday there are many better alternatives especially in the faster 'digital' only 17-50 constant f/2.8 range for cropped cameras!
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