| A | Distance from front edge of lens to front focal point |
| BF | Back focal length |
| C.A. | Clear aperture |
| CT | Center thickness |
| D | Distance from back edge of lens to back focal point |
| DIA | Diameter |
| EFL | Equivalent focal length |
| ET | Edge thickness |
| f/# | f-number (focal length ÷ entrance pupil) |
| FF | Front focal length |
| H | Height |
| H1 | First principal point |
| H2 | Second principal point |
| L | Length |
| nC | Index of refraction for red hydrogen C line (0.6563 microns) |
| nd | Index of refraction for yellow helium line (0.5876 microns) |
| nF | Index of refraction for blue hydrogen F line (0.4861 microns) |
| R1 | First radius (moving from left to right) |
| R2 | Second radius (moving from left to right) |
| R3 | Third radius (moving from left to right) |
| R4 | Fourth radius (moving from left to right) |
| S | Object distance |
| S' | Image distance |
| V1 | First vertex |
| V2 | Second vertex |
| W | Width |
| D | Abbe constant |
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