Originally Posted by darklord
Define better. []
It depends on what/how you are shooting. The 50/1.8 @ f/1.8 lets in 8 times as much light as the 15-85mm @ 50mm f/5 (it's max aperture at that focal length) - of course, at f/1.8 the depth of field will be quite thin. The 15-85mm has IS, but if you're shooting from a tripod (a very good idea with video), IS won't help. If you're on a tripod, and have enough light to set the 50mm f/1.8 to f/5 (where it's very sharp), the 15-85mm won't be significantly better (would possibly be worse, in fact). But if you have to go to something like ISO 1600 or 3200 to use f/5 with your lighting, that's not 'better' and a faster lens would be a definite advantage. If you're going to handhold, IS will be a big benefit. Those are the reasons I recommend the 17-55mm - you get the best of all worlds (fast, IS, great IQ even wide open). But it's not a cheap lens...
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