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i'm a noob.. so don't interpret this as 'pro' advice.. but i'd think you'd typically be fine with f/4.. if you invest in f/4 lenses you could get 2-3 for the cost of the 16-35, for example.
on that note, i've been messing with the 17-40 L and it shoots great. what camera body are you using? if it's a crop body as opposed to a full frame, the 17-40 might not be wide enough.. and the 24-105 might be too tight
edit: i'm an idiot, you said 30d.. that has a 1.6x crop which means the 17mm = 27mm and 24mm = 38mm. keep that in mind.
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