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Old Dec 18, 2005, 7:38 PM   #11
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I'm really looking hard at the Canon 10-22MM -> it's a full stop faster.. what would the Sigma get me over the Canon?
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Old Dec 18, 2005, 8:00 PM   #12
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Wow, didn't realize the 10-22 EF-S was so pricey...
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Old Dec 19, 2005, 10:04 AM   #13
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And don't forget the Sigma 10-20mm one either. Good reviews and cheaper still.
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Old Dec 19, 2005, 11:19 AM   #14
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I don't see the extra f-stop of the Canon as being particularly significant.

This is an ultra-wide, your control of DOF is minimal, and really you will want everything in focus most of the time so you will probably be shooting at f8 or f11 anyway.


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Old Dec 19, 2005, 12:31 PM   #15
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there is no reason to pay the extra for the canon 10-22 unless you absolutely need the 10mm vs 12mm... the tokina is just as sharp if not sharper, is built more robustly, yet is significantly cheaper.. if you are going to upgrade to FF in the future, then the sigma 12-24 is the only option, or just sell the digi-only superwide and get a 17-something when you upgrade to full-frame..
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Old Dec 19, 2005, 12:54 PM   #16
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xtaski wrote:
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Out of curiosity, what will a rectilinear full-frame do for a Rebel XT?
Rectilinear means no curvature or 'fisheye' effect - Check for the straight lines in superwide: http://www.stevesforums.com/forums/view_topic.php?id=68402&forum_id=65
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Old Dec 20, 2005, 2:07 AM   #17
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I believe his point was that 12mm on an XT isn't as wide as the other ultrawide options.

One possible advantage of it might be better corner sharpness on 1.6 crop, even if it sacrifices a couple mm worth of wide angle. Are the corners actually better than the Canon 10-22 or Sigma 10-20?

I've used the Canon 10-22, and found that while the corners were a little soft, it was acceptable given how wide the field of view was.


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xtaski wrote:
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Out of curiosity, what will a rectilinear full-frame do for a Rebel XT?
Rectilinear means no curvature or 'fisheye' effect - Check for the straight lines in superwide: http://www.stevesforums.com/forums/view_topic.php?id=68402&forum_id=65
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Old Dec 20, 2005, 9:54 PM   #18
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Has anyone seen an online comparison of these with say the same shot done on both lenses?
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