Which lens is better?

I'm trying to decide on which lens is the best bang for the buck on these 3, and i'm not sure on which to choose. I would like to spend the amount fpr the Tamron and Sigma, but the reviews for the Canon seem promising, so i have no idea.

The canon has IS if you like to hand hold your camera while shooting... Especially if you are zoomed in to 300mm... that can definitely benefit you.

I doubt anyone has actually tried them all.. I think there are sample shots and writeups on them over in the Canon EF lens forum..

Personally I'd go for the Canon lens

Voted for Sigma but Tamron's new version can be good also.

why do people always forget to read the forum topics... this thread belongs in lenses section....

There's a comparo at http://www.pbase.com/l​ightrules/70300s, but only for the Sigma and Canon.

i voted for the canon, which is the better lens overall. though it will not be the most value lens - that will go to the sigma or tamron.

It is unfair to compare the Canon 70-300 IS with the others - optically it is a good lens ( unusually for Canon in this range) but the addition of IS puts it way ahead - these zzooms really need IS as they precipitate camera shake.

Of the other 2 lenses - the sigma APO macro has the better reputation, and puts the Canon offerings in this range to shame. It also puts the older incarnations of the IS canon 75-300 lenses to shame.

To anyone considering one of these, I'd say go for the IS version if you can afford it, otherwise the sigma is the best.

It's a no brainer that the canon IS would be better, the interesting pole might be between the Sig and Tam...

What Steve said ...