Hi, new to DSLR. I have a new D80 and just learning how to use it. (Nikon SLR for years) Just wondering, if I use an AF lens with an aperture ring, does the DSLR 'know' which f number is set? (i only ask cause i have a zoom with no aperture ring, aperture is either set auto or by turning adjustment dial) Thanks in advance.....Definite DSLR newbie.