GeoKras1989 wrote in post #17036951
The OP is shooting moving people. All the IS in the world isn't going to get clear shots of moving targets at 1/15 (4-stops better than 1/200). A bigger aperture will help a lot more than IS, in this situation.
That fourth stop may not mean a whole lot, but when you're starved for light (because you're shooting indoors), the ability to shoot events at 1/50s (fast enough for portraits) of a second goes a very long way. At 1/50s at F4, You still net out an extra 2 stops of light gathering over the f2.8 non IS and 1/200s
The Dark Knight wrote in post #17040753
Thanks very much everyone. Very useful info to chew on. I think I am going to choose between the 70-20 f/4 IS or the 135L. Size/convenience/budget trumps for me, as I can't see myself using the 2.8 zoom frequently enough to justify the expense and size. The smaller lenses would be something I can use for shooting events but also just for everyday photography. I'd like to reserve the budget for a 2.8 in the 24-70 range instead.
So... 70-200 f/4 IS vs 135L, what do u think?
I love the 135L, but its a niche lens, and not a very good indoor event lens, as the focal length can be hard to work with indoors. I'm not against using primes for events (I often use wider primes during wedding receptions), but I personally could see where the 135L can be a little too restricting....when you're shooting indoors and have limited room, you can always step closer to your subject to frame a shot, but you don't always have the ability to step back.
Between the 70-200 f4 IS and the 135L, the difference can be shots at F4 + stops higher ISO noise, vs not being able to frame a shot at all.