Quote:
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*If* the limiting factor is the amount of light gathered by the objective lens, and not the aperture setting, a "better" lens with a larger objective lens *should* perform better..
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Yes "if", but it's not. The aperture determines how much light gets through the lens.
This isn't that complicated. Everyone go back and read
fletch's post for a summary of how exposure works. Crunch's test was a good example of how exposure can vary between lenses. It's not very much and it doesn't even correlate to price. That pretty much sums it up.
I'm not trying to squash the discussion, just trying to keep it moving in a forward direction.