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Been thinking about giving one of these two lenses a try but can't decide which one. Lenses I already have that cover the range are a Canon ef-s 10-22, Canon ef 24-105f4L and Sigma 24-70f2.8.
This choice isn't to replace any of these lenses but depending on how I get on may be a side effect, but I hate selling stuff
The way I see it the 17-55 is faster, constant f2.8 but heavier and more expensive but considered by many to be the best ef-s lens available.
The 15-85 is wider and longer, cheaper but is slower, that said seems to have an excellent rep.
I can get a spanking new 15-85 for £500ish or a s/h 17-55 for a few bucks more, what would you do :shrug:
This choice isn't to replace any of these lenses but depending on how I get on may be a side effect, but I hate selling stuff

The way I see it the 17-55 is faster, constant f2.8 but heavier and more expensive but considered by many to be the best ef-s lens available.
The 15-85 is wider and longer, cheaper but is slower, that said seems to have an excellent rep.
I can get a spanking new 15-85 for £500ish or a s/h 17-55 for a few bucks more, what would you do :shrug: