| AF | Auto Focus |
| D | Distance Information. Adds distance information to the data transmitted to the camera via chip. Distinguished by the D or G after the lens designation |
| DC | Defocus Control. Allows the photographer to change the degree of spherical aberration in the out-of-focus areas to provide for better bokeh. |
| RF | Rear Focusing. Means that lens achieves focusing by moving the rear elements; similar to IF. |
| SIC | Super Integrated Coating, a multi-layer flare reduction coating, usually applied to the more complex zoom lenses. |