So I've been wondering for a while about aperature settings. My
understanding is that the aperature is basically a ratio between the
actual diamater of light being let through and the diameter of the
barrel correct? What I've been wondering is if say you have two
lenses one is 80mm barrel diameter. and the other is 50. at f/2.8 is
the aperature of the 80mm larger than the 50 mm because of the size
ration? and thus allow more light through? So would the 80mm be a
faster lens than the other since it has more light or am I just making
things up here?