>> >> > Try to compare with Sigma 10-20 f/4.0-5.6 EX DC HSM - is cheaper but
>> >> > quite
[quoted text clipped - 15 lines]
> picture
> is twice better.
What Ken Rockwell has to say:
http://www.kenrockwell.com/tech/digital-wide-zooms/comparison.htm
Yes, I know he talks about Nikon, but his comments on the Sigma are helpful
and here's his comment on the Canon:
The Canon 10 - 22 mm is better than any of these four lenses, including the
Nikon.
"What makes the Canon so superior is its vanishing low distortion. What
little distortion the Canon has is completely fixable in PhotoShop CS2. The
Canon also has a wider zoom ratio than any of the Nikon, Tamron, Sigma or
Tokina lenses."
-more online-

Signature
Peter
Joel - 20 Jun 2008 20:04 GMT
> >> >> > Try to compare with Sigma 10-20 f/4.0-5.6 EX DC HSM - is cheaper but
> >> >> > quite
[quoted text clipped - 29 lines]
> Tokina lenses."
> -more online-
If I look for information of lens I usually look for end users feedbacks
on www.fredmiranda.com or www.photo.net instead of review. Also, I do have
Canon, Sigma, Tamron lens and I tell that from the lens I have the Canon is
usually quicker focus, warmer tone, when Sigma and Tamron may have some
color issue (color casting) which can be corrected with Photoshop.
BTW, since I am not a landscape photographer so 17-50mm is the widest lens
I have, and the wide angle can be very handy.
Robert Coe - 21 Jun 2008 13:07 GMT
: >> >> > Try to compare with Sigma 10-20 f/4.0-5.6 EX DC HSM - is cheaper but
: >> >> > quite
[quoted text clipped - 26 lines]
: The Canon also has a wider zoom ratio than any of the Nikon, Tamron,
: Sigma or Tokina lenses."
By only 2mm at the high end, and almost everybody has a walking-around lens
that bottoms out below 20mm.
Bob
Joel - 21 Jun 2008 17:47 GMT
<snip>
> : What Ken Rockwell has to say:
> : http://www.kenrockwell.com/tech/digital-wide-zooms/comparison.htm
[quoted text clipped - 13 lines]
>
> Bob
Well, if you just compare the "20mm" with "22mm" then you are 100% correct
that it's "2mm" difference between them two. But you look beyond the 2mm
difference then you may find other differences.
Peter - 21 Jun 2008 20:42 GMT
> : >> >> > Try to compare with Sigma 10-20 f/4.0-5.6 EX DC HSM - is cheaper
> but
[quoted text clipped - 36 lines]
>
> Bob
When you deal with wide angle, each mm becomes significant.
I am seriously thinking about the Nikon 10.5 whichis only 1.5 mm more than I
have.

Signature
Peter
Robert Coe - 22 Jun 2008 13:01 GMT
: > : What Ken Rockwell has to say:
: > : ...
[quoted text clipped - 11 lines]
: I am seriously thinking about the Nikon 10.5 which is only 1.5 mm more
: than I have.
At the low end, what you say is true, of course. But my point is that if you
have a decent 18-50mm lens (and most serious SLR users do), it doesn't
particularly matter whether your wide-angle lens goes to 20mm or 22mm on its
high end, because both ranges overlap your 18-50.
Bob