I bet that lens will come in handy for runway shoots.

What's the max aperture on the 24-105IS and on the 28-135IS? What do you think of their optics? How much do they weigh? How fast do they focus?

I've been thinking that a little wider focal range than my 24-70, with IS, could come in handy for wedding work... especially if it was lighter than the 24-70 and lighter than the 70-200IS.

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