| ELEMENT LEFT SURFACE RADIUS | -2.283 INCHES AND 3.710 INCHES |
| ELEMENT RIGHT SURFACE RADIUS | -2.283 INCHES AND -6.036 INCHES |
| ABBE CONSTANT | 64.500 AND 33.800 |
| BACK FOCAL LENGTH | 5.225 INCHES |
| AXIAL THICKNESS | 0.689 INCHES NOMINAL AND 0.157 INCHES NOMINAL |
| COMPOUND LENS EDGE THICKNESS | 0.590 INCHES NOMINAL |
| COMPOUND LENS OVERALL AXIAL THICKNESS | 0.846 INCHES NOMINAL |
| COMPOUND LENS STYLE | DOUBLET |
| DIAMETER | 2.518 INCHES MINIMUM AND 2.520 INCHES MAXIMUM |
| EQUIVALENT FOCAL LENGTH | 5.404 INCHES |
| FRONT FOCAL LENGTH | 5.018 INCHES |
| FSC APPLICATION DATA | 1. FIRE CONTROL COMPUTING SIGHTS AND DEVICES |
| INDIVIDUAL LENS STYLE | DOUBLE CONVEX AND MENISCUS DIVERGING |
| 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 1.6490 NOMINAL |