Originally Posted by Rubber_Duck
May I know what is the different between these 2 lens??
Tamron 17-50mm f2.8 instead of Canon's 17-85mm IS f4.
the tamron is a faster lens @ f2.8 while canon 17-85mm is slightly slower, but with IS, it compensates hand holdability while taking photos in low light situation.
it's a hard to make decision imo... but i'll go with the tamron.
just a side note, someone actually discussed about choosing between the both lens before.