How does the lens diameter influence photo quality?
I'm wondering about 50mm f/1.4 for Nikons. The Nikon 50mm f/1.4D has a 52mm filter size. The Sigma 50mm f/1.4 has a 77mm filter size. There's a lot more glass in the Sigma.
So, does having a larger filter size mean that a lens will collect more light, and therefore produce better photographs?