| ELEMENT LEFT SURFACE RADIUS | 3.661 INCHES |
| ELEMENT RIGHT SURFACE RADIUS | 1.705 INCHES |
| ABBE CONSTANT | 42.500 AND 60.500 |
| AXIAL THICKNESS | 0.158 INCHES NOMINAL AND 0.472 INCHES NOMINAL |
| BACK FOCAL LENGTH | 12.454 INCHES |
| COMPOUND LENS EDGE THICKNESS | 0.562 INCHES NOMINAL |
| COMPOUND LENS OVERALL AXIAL THICKNESS | 0.630 INCHES NOMINAL |
| COMPOUND LENS STYLE | DOUBLET |
| DIAMETER | 1.900 INCHES NOMINAL |
| EQUIVALENT FOCAL LENGTH | 13.161 INCHES |
| FSC APPLICATION DATA | PERISCOPE,INTEGRATED WITH FIRE CONTROL EQUIPMENT |
| INDIVIDUAL LENS STYLE | MENISCUS DIVERGING AND MENISCUS CONVERGING |
| MATERIAL DOCUMENT AND CLASSIFICATION | MIL-G-174, CLASS 1, GRADE B MIL SPEC SINGLE MATERIAL RESPONSE |
| MATERIAL | GLASS OPTICAL |
| REFRACTION INDEX | 1.5725 NOMINAL AND 1.5125 NOMINAL |