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if only outside, the 24-105 will be handier, if trying to use it indoors, you're going to want to have a good flash as the slower f stop will be very noticable (though the IS does help)
if you want shots of people and blured backgrounds as well as the ability to shoot indoors, i would lean towards the 2.8
generally what i've read, and in talking to people, the 24-70 is supposed to be the sharper of the 2, but that comes at a price, if you're walking around a lot with that lens, it is very heavy after a period of time, where the F4 is considerably lighter, that in itself can be a large selling point
so if you're renting these, staying outdoors, and walking a lot (my nyc experience was 90% outdoors) i would lean towards the 24-105 you'll have a better time, and your neck won't hurt as much.
if you're playing with the dinosours in the museam of natural history and such, that 24-70 might be a nice option.
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