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<p style="margin-bottom: 0in;"]I'd take a Sigma over a Tamron lens any
day of the week. I had the sigma 10-20 4-5.6 and it was a solid lens.
My lens saw all kinds of weather and dust and thousands of pictures
later it was in perfect shape when I sold it. I bought it from Amazon
where I did not get to do any testing with it before I had it in my
hands. If you get a bad copy of a lens from amazon they will
reimburse you to ship it back to them and replace it. I sold my
lens because I did not need it anymore because of my 5DII purchase.
Sigma now even produces a 10-20mm F3.5 EX DC HSM lens just like the
Canon. Looks like the sigma 10-20 4-5.6 has all good review at the
Adorama website and is less expensive then the Canon plus you get a
lens bag and a quality lens hood with it. It was a great investment
for me while I had it and did not even lose that much in the sale two
years later. In the beginning when photography was more of a
hobby/interest I bought a Tamron 2.8 lens where I can say I've never
though about or bought one again once I returned it. After years of
buying a lot of lenses I've now adopted the attitude spend a little
more in the beginning as later down the line you will be glad that
you did.