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PostPosted: Sat Oct 30, 2010 10:38 pm 
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Joined: Sun Aug 29, 2010 11:52 am
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Location: Surrey, UK
Hi,
I have found a Sigma 18-200mm OS lens for a very reasonable price. I have a quick question about this lens. How does it compare against my current canon 18-55mm kit lens in terms of image quality. I know I shouldnt expect much from a lens like this but thought it might be a little better than my current one. Plus the big focal range is very appealing.
Any advice would be greatly appreciated.

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Camera: Canon 550D with battery grip
Lenses: Canon 24-105mm f/4L, Canon 50mm f1.4, Canon 18-55mm, Tamron 70-300mm,
Accessories: Manfrotto 055XPROB with 808RC4 head, Canon 430ex II speedlite, Lowepro Nova 180AW and Lowepro Pro Runner 450AW


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PostPosted: Sun Oct 31, 2010 2:04 pm 
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Joined: Mon Jan 18, 2010 3:52 pm
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Location: The Netherlands
I think the quality should be equal, more or less the same.

But dont expect the 18-200 to deliver sharp images, just as good as your 18-55 or maybe ever worse.
Look at Google for reviews.

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Ruben

Panasonic DMC-FZ18, Panasonic DMC-FZ28, Canon G5, Canon 350D, Canon 50D + BG-E2N
Tamron 17-50 2.8, Canon EF 70-200mm f/4L USM,
Canon 18-55 II plus lots of Minolta MD/M42 lenses and bodies


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PostPosted: Sun Oct 31, 2010 2:28 pm 
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Joined: Sun Feb 15, 2009 12:59 pm
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Location: The Netherlands
To quote Photozone about the sharpness:

Quote:
In terms of resolution the Sigma shows a bit of a roller-coaster ride throughout the zoom range. At 18mm the results are surprisingly good - the center resolution leaves nothing to be desired and the border quality is very good even at large aperture settings. At 35mm the situation changes dramatically. The center performance is still exceptionally high but the border quality is absolutely dismal at f/4 and f/5.6. The field curvature is quite hefty at this setting. It is advisable to avoid anything faster than f/8 at this setting. (FWIW, the Sigma 18-200mm non-OS showed also a performance breakdown at 35mm). Interestingly the weakness is gone at 50mm where the lens is capable to produce a pretty good and even center to border quality. At 100mm the lens shows a downward trend again - the center quality is very good but the borders and specifically the extreme corners are softer. The very good peak performance is reached at f/11 here. Surprisingly the border quality can recover again at 200mm.


Then again, sharpness is overrated, and the lens seems to do quite well in other fields. The stabilisation works, vignetting is kept under control, CA is decent for this type of lens.

Looking at that, I'd say it will not be an upgrade in sharpness (and not really a downgrade either, but if you want that extra 50-200mm in one lens...go for it!

Otherwise, consider an additional lens like a 70-300 (stabilised).

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PostPosted: Sun Oct 31, 2010 2:46 pm 
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Joined: Sun Aug 29, 2010 11:52 am
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Location: Surrey, UK
Thanks everyone I think I will buy the lens as my friend is selling his for a lot less than the retail price. The lens is also in perfect condition as he is really into cleaning his lenses and keeping them perfect. :)

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Camera: Canon 550D with battery grip
Lenses: Canon 24-105mm f/4L, Canon 50mm f1.4, Canon 18-55mm, Tamron 70-300mm,
Accessories: Manfrotto 055XPROB with 808RC4 head, Canon 430ex II speedlite, Lowepro Nova 180AW and Lowepro Pro Runner 450AW


Oh that is so lame, every hot girl who can aim a camera thinks she’s a photographer -Stewie Griffin


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PostPosted: Sun Oct 31, 2010 5:21 pm 
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Joined: Mon Jan 18, 2010 3:52 pm
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Location: The Netherlands
BUT, if I were you I should not sell your current lenses as they may have better IQ, and you want to go back to 2 lenses instead of 1 superzoom.

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Ruben

Panasonic DMC-FZ18, Panasonic DMC-FZ28, Canon G5, Canon 350D, Canon 50D + BG-E2N
Tamron 17-50 2.8, Canon EF 70-200mm f/4L USM,
Canon 18-55 II plus lots of Minolta MD/M42 lenses and bodies


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PostPosted: Sun Oct 31, 2010 5:32 pm 
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Joined: Sun Aug 29, 2010 11:52 am
Posts: 861
Location: Surrey, UK
I will definitely keep my 18-55 mainly because it is not worth much and also because it might be better than the sigma. Also I wouldnt sell my tamron 70-300mm as I know it has better image quality at the longer focal ranges and I need the image quality for the sports photography I do.

When I am doing sports photography I sometimes find 70mm is not wide enough. Is there a lens from any manufacturer that offers a wider focal range whilst still having around 300mm. And it must have very good image quality. I know there is the tamron 18-270 but like the sigma it has bad image quality at longer focal ranges.

Any help would be great.

_________________
Camera: Canon 550D with battery grip
Lenses: Canon 24-105mm f/4L, Canon 50mm f1.4, Canon 18-55mm, Tamron 70-300mm,
Accessories: Manfrotto 055XPROB with 808RC4 head, Canon 430ex II speedlite, Lowepro Nova 180AW and Lowepro Pro Runner 450AW


Oh that is so lame, every hot girl who can aim a camera thinks she’s a photographer -Stewie Griffin


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PostPosted: Mon Nov 01, 2010 6:57 am 
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Joined: Mon Jan 18, 2010 3:52 pm
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Location: The Netherlands
55-250IS from Canon?
That 50mm on the last end wouldnt hurt you :wink:

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Ruben

Panasonic DMC-FZ18, Panasonic DMC-FZ28, Canon G5, Canon 350D, Canon 50D + BG-E2N
Tamron 17-50 2.8, Canon EF 70-200mm f/4L USM,
Canon 18-55 II plus lots of Minolta MD/M42 lenses and bodies


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PostPosted: Mon Feb 21, 2011 8:22 am 
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Joined: Wed Aug 11, 2010 9:38 am
Posts: 41
Location: Shenzhen, China
I've read that the Sigma 18-200 OS is pretty much equal to the Canon 18-55 IS in the same range. Not sure about the old non-IS version, but I'd probably go with the Sigma. Seeing that you already have a Tamron 70-300, not sure you really need this lens. But if you're a casual kind of shooter, there is no denying its fun factor. Here's a review I wrote on it: http://www.aputure.com/blog/2010/11/24/ ... h-samples/

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