Putz! Belo trabalho.
Contribuindo com a descrição da sigla AF-D Nikon que ficou um pouco acanhada.
(ref.
www.kenrockwell.com)
"....
AF-D, "D Type" (Distance Information)
"D" means these lenses let the camera know the distance at which the lens is focused. All lenses introduced since 1992 have been "D."
This can help the camera set flash exposure more accurately if the subject occupies only a small part of the frame, or if you're shooting into mirrors or very light or dark subjects. With non-D lenses the camera is more likely to get tricked into the wrong exposure in these odd cases.
..."