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Originally Posted by abarickman
For instance can I shoot at a lower ISO and underexpose and then push it in processing or will this be worse?
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You can achieve a higher shutter speed that way, but at the expense of added noise. Sometimes it's worth it, sometimes it isn't. This is a shot at a panel where they were giving a slide presentation, so I was literally shooting int he dark. I shot RAW, underexposed by three stops, maxing out my iso and aperture, and I brought it up maybe a stop and a half in Lightroom. Even with some noise reduction applied, noise is visible, but there's very little motion blur. You pick your battles.
Canon XT/350D. EF 135mm f/2L USM. iso 1600. f/2. 1/80s.
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I imagine that concert photogs have these same problems only worse. How do they do it?
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With fast primes and bodies that do high iso. You may want to consider giving up zoom for wider max. apertures. There's a reason a lot of people like an EF 85mm f/1.8 USM.
I routinely use a EF 135 f2L USM with my XT to shoot available light at Comic-Con. Because the 135L is extremely sharp wide open and it's fast and accurate to autofocus, I have no fear using it at f/2 nearly all the time. It makes me very happy.
XT/350D. iso 800. f/2. 1/1000s.
XT/350D. iso 1600. f/2. 1/250s.