Tom Pfeiffer wrote:
Gary: I've heard good things about the Sigma 20mm f/1.8, that might be one to consider.
The 20-35L I had was very sharp, I'd say as sharp as the 17-40L I have now (and which is the lens your asking about, I believe), although I didn't own them both at the same time. Since you mention this is a new 20D, maybe the issue is the normal lack of in-camera sharpening and not your lens?
------------------------------------------------------------------------ ------------ Well, this is interesting. I had always thought the 20-35mm was sharper than the 17-35mm. Also, we recently ran a comparison at a San Jose studio using a EOS 1D Mk II taking the same shots with a 20-35mm F2.8L and a Tamron 20-40mm F2.7-3.5. Wide open (both set at F2.8) and at F8, the Tamron was far and away superior to the Canon 20-35mm F2.8L away, that is fact. I was really surprised by this one. What I really want to see is how much better the new Di lense are.
Peter K
I don't have the shorter Di lens as I am well equipped in the WA range, but got the 28-75 about a year ago after trying out the 28-70L and 24-70L lenses on (at that time) D60 and film bodies. The Tamron was noticeably better than the 28-70 on both film and digital bodies w.r.t. resolution and freedom from aberrations, and was better on digital and as good on film as the better of the two 24-70 lenses. The build quality is not as high, and the lack of USM and full time manual are downsides, but optically the lens is superb, and its images look very good alongside those of the primes and the 70-200/2.8 IS and 16-35. If the shorter Di lens is anything like this one, I can only say, Go for it! In the 28-35 region where the Tamron 28-75 Di lens and the 16-35 lens overlap, the Tamron is superior by my criteria.
From the reports of others, the 17-35 Tamron Di is also excellent, and should definitely be looked at if you are considering a lens in this range. Again, the lack of USM and lower build quality might mitigate against a purchase, but Tamron do seem to have their optical team in high gear.
For available light, the 24/1.4 lens rules. i have a couple of other 1.4 lenses, but this one gets by far the most use, particularly on a 1.6 crop factor digital body.
This was shot on a 20D at ISO 3200 at f/1.8 with the 24. It was _dark_ in that restaurant.
http://archiphoto.com/Various/Saturday_Nov6/source/6.htm
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