I've read that this lens would start at the 34"? 38"? wide angle on a crop sensor. This kinda scares me since I'm not sure if that's wide enough for an all-around zoom. Also, the f4 would seem to be a bummer with low light conditions?
yeah its meant as a wide angle all purpose on a FF body. I had the 15-85 which I loved - especially for the wide - except I found for my style of shooting - I rarely shoot really wide so I opted for the 24-105 for the increased long end, which the f/4 comes in handy for.
Sounds like you may wish the 15-85 or the 17-55 f/2.8 - all three of these lenses are excellent zooms, comes down to shooting styles