
I recently was taking pictures at a wedding reception. I was using my 24-105 4L and when they dimmed the lights after dinner, had a HELL of a time with AF focusing on ANYTHING. I've never had that problem before but I don't think the ambient has ever been quite that low in my experience. I was at the slowest shutter and highest ISO I was comfortable with, but had problems.
Here's my question. I also have a 70-200 2.8IS (LOVE IT) but at times it's too long for receptions. Not to mention it weighs a hundred pounds...
Anyway - should I be considering a 24-70 2.8L? Or should I just suck it up and use the zoom? Anyone wanna trade? :P
I don't see the exposure settings you're talking about being uncomfortable with...
I've shot with the 70-210 @ 1/40 sec wide open (3.5-4.5) and have gotten nice results @ ISO 1000 but that's just me...
If you're not happy with the results could be you should go with a 100-135mm prime...lighter and sharper wide @ F2.8
Good luck...