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Old Feb 16, 2006, 2:51 PM   #11
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So if the Sigma is as good as the Cannon do I really need to spend the money on a Cannon? For now this is a hobby but, I'm hopeing it can lead to making money
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Old Feb 16, 2006, 3:31 PM   #12
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joelet wrote:
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So if the Sigma is as good as the Cannon do I really need to spend the money on a Cannon? For now this is a hobby but, I'm hopeing it can lead to making money
The Canon has a slightly better build quality - although the Sigma is still built very well. MTF charts I believe indicate the Canon is slightly sharper but I haven't heard of many real use examples where the sharpness / color / contrast of the Canon was noticably better than the Sigma. I have also been told by a pro sports shooter that used both that the Canon focused slightly faster. But that was only one person I've heard that from. I don't think I've ever heard anyone claim the Sigma is actually BETTER than the Canon though. So, bottom line I don't think actual performance differences between the two are any where near worth $300 price difference.

But, there is always the 'future compatibility' question. That's a risk only you can decide if you want to take. If you're concerned with that then the Canon is clearly the way to go. If that risk doesn't bother you than the Sigma will perform just as well as the Canon.
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Old Feb 16, 2006, 5:52 PM   #13
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I have read some reviews that the Sigma is about 2.5 lbs. Does the Cannon have this kind ofweight?

Joe
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Old Feb 16, 2006, 6:05 PM   #14
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joelet wrote:
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I have read some reviews that the Sigma is about 2.5 lbs. Does the Cannon have this kind ofweight?
The same Canon f/2.8 is 2.9lb (the IS version is 3.2lb) :blah:
-> you 're probably comparing to the f/4 which is 1.6lb...

The maximum aperture of a lens is the ratio of the lens opening vs its focal lenght - therefore a faster lens with the same focal length requires to be larger hence bigger glass, which means more metal which weight (and cost) more!
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Old Feb 16, 2006, 7:00 PM   #15
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Well after everything I have read here and in reviewsfrom other forums the Sigma wins I'm going to order one tomorrow. THANK YOU everyone you all gave great advise and I recommend that if you are an amateur this is the place to be you guy are great. I'm sure we will talk again.

Thanks

Joe


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Old Feb 16, 2006, 7:10 PM   #16
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NHL wrote:
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joelet wrote:
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I have read some reviews that the Sigma is about 2.5 lbs. Does the Cannon have this kind ofweight?
The same Canon f/2.8 is 2.9lb (the IS version is 3.2lb) :blah:
-> you 're probably comparing to the f/4 which is 1.6lb...

The maximum aperture of a lens is the ratio of the lens opening vs its focal lenght - therefore a faster lens with the same focal length requires to be larger hence bigger glass, which means more metal which weight (and cost) more!
It doesnt seem that heavy at 1st but after 21 inning of baseball(3 hs games) you can have a very very sore wrist if your not used to it.
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