| AF | Auto Focus |
| APO | APO Lens. APO lens has been made using special low-dispersion (SLD) glass and is designed to minimize color aberration. |
| CONV | APO Teleconverter EX. This lens can be used with the APO Teleconverter EX. It can increase the focal length and will interface with the camera's AE (automatic exposure) function. |
| 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. |
| RF | Rear Focus. This lens is equipped with a system that moves the rear lens group for highspeed, silent focusing. |