| AF | Auto Focus |
| APO | APO Lens. APO lens has been made using special low-dispersion (SLD) glass and is designed to minimize color aberration. |
| DG | These are large-aperture lenses with wide angles and short minimum focusing distances. With an abundance of peripheral illumination, they are ideal lenses for Digital SLR Cameras whilst retaining suitability for traditional 35mm SLRs. |
| EX | The exterior of this lens is EX-finished to denote the superior build and optical quality, and to enhance its appearance. |
| HSM | Hyper-Sonic Motor. This lens uses a motor driven by ultrasonic waves to provide a quiet, highspeed AF. |