IMO, the 24-105mm f/4L is pretty much the ideal walkaround lens on FF. I wouldn't be too worried about the f/4 - keep in mind that the crop factor applies to DoF as well, so an f/2.8 lens on a crop body will have the same depth of field as f/4.5 on a full frame body.
Having said that, I absolutely love my EF-S 17-55mm f/2.8 on my 7D - for a crop body, I think it's the best choice as a walkadound lens, and is the one that's on my camera most of the time.
Originally Posted by neuroanatomist
I have the luxury of owning both lenses and could not agree more. [Y]
Edited: Addedneuroanatomist's missing quote.
I had the 17-55 in combo with the 50D and now I have the 24-105 on FF and I couldn't agree more either...buttt....
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Untill that time you will find yourself wanting a shallower depth of field than f4 on a APS-C body. So you need to find out what time-line you're in. Are you going to upgrade within a year for instance, the 17-55 will be a moneybreaker (that happened to me[A]). Since you have to sell it so soon.
If your planning is longer term, the 17-55 is a safe bet and the best bet in my opinion. It's a very good lens!
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My suggestion, go with f2.8 immediately so you wont have second thoughts later on. I personally don't shoot a lot at f2.8 or bigger so I wouldn't mind the f4.
My final suggestion: figure out what your future plans are and in what time they are planned. After that you couldn't make the best decision yourself.
Jan
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