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Old Jul 13, 2005, 10:53 PM   #1
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I am about to invest in a canon rebel xt and need a good quality lens for equine photography (action shots) where I will most likely 85% of the time be working in low light conditions. I am considering either the Canon EF 70-200 mm f/2.8L IS USM lens or the Sigma 70-200 mm f/2.8 APO EX HSM lens.

Is the canon lens worth double the sigma lens? Are there any major quality differences?

Thanks for any help.
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Old Jul 13, 2005, 11:25 PM   #2
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Usually, this topic comes quite often...

One member, fstopjojo, happens to take lots o' lens comparison tests:

http://www.pbase.com/fstopjojo/3telezooms

But one thing to point out immediately is IS is completely useless for action shots. If you're going to compare lenses (for your needs), it might as well be only the EF 70-200 f/2.8 vs Sigma 70-200 f/2.8 .

As far as I know, the IS and non IS version of the EF lens has the same optical quality, and as apparent from jojo's test, the quality between Canon and Sigma are not extremely different.
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Old Jul 13, 2005, 11:29 PM   #3
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the sigma is a quality lens. be sure to check out that link for side-side comparison...
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Old Jul 13, 2005, 11:38 PM   #4
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See this test also: http://www.pbase.com/fstopjojo/70200s

Best wishes on your choice.
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Old Jul 13, 2005, 11:45 PM   #5
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Thanks for all of the help!

I am fairly new to all of this and am just now updating from a little sony dsc to a digital slr.

So now I have another question since the point was brought up about IS - what exactly is it and in what circumstances would I want it?

thanks again!
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Old Jul 13, 2005, 11:56 PM   #6
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emily01 wrote:
Quote:
So now I have another question since the point was brought up about IS - what exactly is it and in what circumstances would I want it?
IS allow you to take pictures with a slower shutter speed that normal, this usually would require a tripod to prevent camera shake. The problem is when this shutter speed is too slow it can't prevent the movement from the actual subject which cause the bluring

Take a look at this image taken @ 1/20s from Luminous Landscape with "Anti-Shake":




The static objects remain sharp, but the man walking by is blurred by his own movement which the camera can't detect nor correct for...
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Old Jul 14, 2005, 12:38 AM   #7
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If you go with the Sigma, go with the new EX HSM DG version. Supposedly, it is optimized for digital photography.
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Old Jul 14, 2005, 12:45 AM   #8
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actually i would get the non-DG as it is a heck of a bargain now at 650ish.. and isjust fine for digital..
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Old Jul 14, 2005, 8:49 AM   #9
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I just put in this comment regarding the 'warming' filter built-in to almost all Sigma lenses: http://www.pbase.com/fstopjojo/image/42921325
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Old Jul 14, 2005, 10:23 AM   #10
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Advice revoked; due to ultra high bs levels thread has attained.
I refuse to continue to participate in threads that exhibit brand bigotry, or just expound on plain bad advice.
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