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This is an excellent choice if you're interested in close-up and macrophotography -it's sharp corner-to-corner, and you get life-size photos down to the size of a large bug. Usually you end up focusing macro shots manually, and the Tamron manual focus ring travels about 270 degrees, giving lots of smooth fine-tuning capability.
For portraits and medium telephoto shots, the autofocus capability works well but it's audible. You can set a limiting switch so that it won't hunt through the entire range, from 8" to infinity. It's easy to switch from autofocus to manual by feel -you can do it without moving your eye from the viewfinder.
There are probably better choices if you want to do portraits first and macrophotography second -Canon's 100mm and Sigma's 105mm macros, in particular, but the Tamron is an excellent choice for macro work.
The lens body is plastic, so it's lighter than OEM lenses from Canon & Nikon. The light weight makes one wonder about how rugged it is, but it feels well put together, and anyway you shouldn't be using a lens to drive nails.
Note that the 90mm designation applies only to full frame SLRs. On digital SLRs like the Canon 300D & 350D or the Nikon D50 & D70, the lens gives you an effecive focal length of about 130mm. So you get a bit more working distance for macro subjects, but you may have to stand back too far from the subject for portraiture.
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