I see a Canon 10-22, but it's an EF-S, so that's a no-go for my 5d. Yes - there is an "L" option, but right now out of the budget (I have other L lenses and LOVE them). Currently, I use my 24-105 4 as my "go to" daily lens, but also have the 70-200 4 and 100 macro (all L's) Other ideas? I've been doing more hiking to waterfalls and have a really wide option in my bag would have been quite nice on a few occasions. Doesn't have to be an ultra wide zoom - I'm OK with a prime wide angle. Ideas?