| AF | Auto Focus |
| AS | Aspherical Optics |
| IF | Internal Focus System. Number of advantages: 1. Faster focusing, 2. Improved handling due to fewer movements near the center of gravity, 3. More compact lens designs, 4. Superior use of filters because the barrel with the filter thread does not rotate |
| One Touch FC | One Touch Focus Clutch Mechanism. This improvement means it is not necessary to change the AF/MF switch (on the body with Nikon or the lens with Canon) every time the lens is changed from auto focus to manual focus mode. |
| SD | Super Low Dispersion. Minimizes the secondary spectrum or optical noise caused by chromatic aberration. |