The newer better (7D, 1D MkIV) have sensors that are larger, and in being larger, they are more sensitive to light. working better in the f4.5-5.6 of the 100-400L. So yes, bodies do play a part, and there is some new tech in this area. I'm sure some of it wil trickle down to the lower end cameras in the near future.
Andrew Rodgers
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Canon 50D 24mm, 50mm, 100-400mm, 28-135mm
Panasonic Lumix TZ-3 Yeah, I have optical image stabilization and a 10X lens, it also fits in my pocket.
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