both lens are different purpose
17 40 is designed for FF, work as UWA lens for FF, internal focus. I like the color from this lens but FL is narrow for APS-C unless you use FF.
15 85 is a new lens designed for APS-C camera. It has 4 stops IS and the size is just nice. Not as big as 17 55.
For me, 15 85 is a bit over priced but i saw in BS is selling less than 800. It's quite reasonable for me but not for the new lens.(pricey for the new one)
I prefer sigma 17 70 OS instead of canon 15 85.
do u need the extra FL or do u need the L lens?
for me, i prefer 15 85.....
it's only my opinion
17 40 is designed for FF, work as UWA lens for FF, internal focus. I like the color from this lens but FL is narrow for APS-C unless you use FF.
15 85 is a new lens designed for APS-C camera. It has 4 stops IS and the size is just nice. Not as big as 17 55.
For me, 15 85 is a bit over priced but i saw in BS is selling less than 800. It's quite reasonable for me but not for the new lens.(pricey for the new one)
I prefer sigma 17 70 OS instead of canon 15 85.
do u need the extra FL or do u need the L lens?
for me, i prefer 15 85.....
it's only my opinion