Been looking to upgrade my walk-about lens lately, and I've been trying to wrap my head around filter sizes. Google was no help, so I thought I'd bring it here. What is the difference, in terms of the amount of light coming in, between say a lens with a 58mm filter size and a lens with a 77mm filter size? Does the 77mm let in more light, allowing for a faster exposure? Or is there some other advantage I'm missing?