I am looking for a good lens for taking portraits and came across this impressive Tamron lens, which I was able to test. Without a doubt the image quality is superb but there is one thing that might push me towards an alternative lens.
The Tamron SP AF 90mm F/2,8 Di MACRO 1:1 is a very good lens and when you are going to advance into macro photography this is probably the lens of your choice. The picture quality is really great (see this photo's original resolution on Flickr), but when it comes down to portrait photography the focussing is just too slow. Both imaging performance and wide aperture make this lens really popular, but what it needs to make it a complete portrait lens is a quick focussing motor which Tamron unfortunately can't offer.
So this is why I am going to buy the Canon EF 85mm 1:1.8 USM. For me the speed is much more important than the great macro opportunities of the Tamron.