there is a lot of talk bout the 17-50mm but i was curious to know if this any good because the 50mm does not have enough zoom but a 55-200 is to much i thought this would be a good happy medium for me.
I would be planning to use this lens for action sports stuff trampoline, bmx, ski etc
with a canon t3i
http://www.tamron.com/en/photolens/di_hi_speed/a09.html