I picked up this lens this afternoon and spent a wonderful few hours snapping away in my neighbourhood. While these shots don't show off its wide-angle capabilities, I was very pleased with the colour, dof, and sharpness.
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This is my first third-party lens, and I remembered people's complaints of other third-party lenses while I was evaluating it in-store -
"focus and zoom rings are in reverse" - this only took me a couple of minutes to get used to. I don't think I missed any shots as a result.
"autofocus isn't USM" - no, but then again, it's also $700-800 cheaper than the 17-55IS, the nearest Canon equivalent.
"crappy plastic build" - I find the build to be quite sturdy, with focus and zoom movement solid, but smooth. It has a decent weight to it, and on my XT with grip, I find it to be very nicely balanced.
I understand that if held facing down, the barrel can extend. To counter that, Tamron have fitted the body with a lock on the opposite side of the AF/M switch which will keep the barrel locked at the 17mm position. I like the lens cap, but not the end cap so much. I'm pleased that I don't have to fork out additional cash for a lens hood - something which Canon would do well to emulate.
I was very close to buying the Tamron 28-75 f/2.8, when I happened across this in the store. I'm so glad they were out of stock of the 28! I haven't evaluated Sigma's equivalent, but if the Tamron 17-50 is essentially the same lens as the 28-75, the $450 price tag and excellent performance (2.8 all the way!) should make this a very interesting summer for wide angle crops.


. congrats and nice pics


