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In an ideal world I would have gone for the canon ef.
However I recently got the Sigma 10 to 20 .saving myself a fair sum of money.
I have yet to see a bad review of that lens .
Surprisingly even the difference of 10 versus 11 mm at the wide setting is quite dramatic .
Sigma is widely available too.
If you were thinking of it it's well built ,has whisper quiet and accurate focussing ,built in hood ,and a good padded case.
Read another review where the owner of the lens tested the newer fixed aperture version f 3.5 throughout .She liked it but came to the conclusion it was not worth upgrading.
Finally I tried the tamron and was less than impressed with it's build just felt sloppy and plasticky.I would rate the sigma as equally qell built as my canon efs lenses.
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