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Here are a couple of "real world" shots with 100% crops from
center and edge sections. The first image (below) was taken at a 17mm setting.
The 100% crops were taken from the areas outlined in red.
Note again that these are shots taken with an EOS 20D DSLR with an APS-C sized
sensor. This means the edges of the frame are 11mm from the center. A full frame
image is 36mm wide, so the edges are 18mm from the center. Image quality would
likely be somewhat lower and chromatic abrration higher at the edges of a full
frame 35mm image.
As you can see, performance is pretty good, even wide open at
17mm and even towards the edge of the frame (using the EOS 20D with a 22mm wide
frame). The lens does sharpen up a little both in the center and at the edge when
stopped down to f8, but the f2.8 performance is good enough that you don't need
to stop down to get a good image.
Below is a shot of the same scene, but zoomed to 35mm. The
100% crops were taken from the areas outlined in red.
At 35mm the maximum aperture of the lens is f4 and real world
performance wide open isn't bad. It is evident though that stopping down to f8
does show some image improvement, particularly at the edge of the image where
contrast and sharpness are improved (see the "K" in BANK).
Overall Conclusions
The Tamron SP AF17-35/2.8-4 Di LD Aspherical (IF) is a well built
lens with overall good performance. At 17mm it's very good and can be used wide
open at f2.8 without much worry about image quality. The only negative is
noticeable barrel distortion which could be a problem in some circumstances.
Chromatic aberration is present but fairly well controlled throughout the zoom
range. At 35mm the lens is slower (f4) and a little less sharp, though distortion
is low.
The obvious competitors to the Tamron SP AF17-35/2.8-4 Di LD
Aspherical (IF) (ca. $460) are the Canon EF 17-40/4L (ca. $680) and the
Canon 16-35/2.8L (ca $1400) in the Canon line, and the Sigma 17-35/2.8-4
EX DG (ca $470). Unfortunately I can't make any direct comparisons since neither
Canon nor Sigma have provided me with lenses to test!
I did look at a few shots taken with the Canon EF-S 18-55/3.5-5.6 lens and
compared them with the The Tamron SP AF17-35/2.8-4 Di LD Aspherical (IF). Perhaps
somewhat surprisingly, when stopped down there wasn't much difference in the
center of the frame. The Tamron lens tended to give better images wide open and
at the edge, but for a 20D/Digital Rebel owner the question of whether the Tamron
is worth 5x the cost of the Canon is a difficult one. The images certainly aren't
5x as good. The Tamron is undoubtedly better built, covers the full 35mm frame
and is faster, but if you're shooting stopped down with an APS-C sensor digital
camera, the EF-S 18-55 does pretty well in the 18-35mm range (it gets weak at
55mm). See the
EF-S
18-55 review.
If you're looking for a fast, wide (17mm) lens, the Tamron is a
stop faster than the Canon 17-40/4L at the wide end and over $200 cheaper, which
makes it an attractive option. It's $950 cheaper than the Canon 16-35/2.8L,
though the Canon is 1mm wider and a constant f2.8. Both Canon lenses are USM with
full time manual focus and the Tamron isn't, so that factors into the equation
too. If you're looking for a lens mainly for the longer end, then the Canon
17-40/4L offers you an extra 5mm of focal length and the 16-35/2.8L offers you an
extra stop. Overall the Tamron SP AF17-35/2.8-4 Di LD Aspherical (IF) seems like
a fair compromise, perhaps not offering quite as much as the Canon "L" lenses in
some respects, but available at a significantly lower cost.
Note that there is a $40 rebate on the Tamron SP AF17-35/2.8-4 Di
LD Aspherical (IF), which runs until April 30th 2005. See
http://www.tamron.com/lenses/assets/rebates/tam_rebate_Jan05.pdf
for full details. Tamron's standard 6 year warranty applies on this lens.
