| ELEMENT LEFT SURFACE RADIUS | -1.705 INCHES AND 1.705 INCHES |
| ELEMENT RIGHT SURFACE RADIUS | -1.705 INCHES |
| ABBE CONSTANT | 64.500 AND 36.200 |
| AXIAL THICKNESS | 0.866 INCHES NOMINAL AND 0.157 INCHES NOMINAL |
| BACK FOCAL LENGTH | 4.090 INCHES |
| COMPOUND LENS EDGE THICKNESS | 0.619 INCHES NOMINAL |
| COMPOUND LENS OVERALL AXIAL THICKNESS | 1.024 INCHES NOMINAL |
| COMPOUND LENS STYLE | DOUBLET |
| DIAMETER | 2.204 INCHES MINIMUM AND 2.205 INCHES MAXIMUM |
| EQUIVALENT FOCAL LENGTH | 3.952 INCHES |
| FRONT FOCAL LENGTH | 3.170 INCHES |
| FSC APPLICATION DATA | FIRE CONTROL COMPUTING SIGHTS AND DEVICES |
| INDIVIDUAL LENS STYLE | DOUBLE CONVEX AND PLANO-CONCAVE |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-G-174, CLASS 1, GRADE C MIL SPEC SINGLE MATERIAL RESPONSE |
| MATERIAL | GLASS OPTICAL |
| REFRACTION INDEX | 1.5170 NOMINAL AND 1.6210 NOMINAL |