| ELEMENT LEFT SURFACE RADIUS | 1.1470 INCHES |
| ELEMENT RIGHT SURFACE RADIUS | 1.4810 INCHES |
| ABBE CONSTANT | 57.400 AND 33.800 |
| AXIAL THICKNESS | 0.405 INCHES NOMINAL AND 0.088 INCHES NOMINAL |
| BACK FOCAL LENGTH | 1.668 INCHES |
| COMPOUND LENS EDGE THICKNESS | 0.250 INCHES NOMINAL |
| COMPOUND LENS OVERALL AXIAL THICKNESS | 0.493 INCHES NOMINAL |
| COMPOUND LENS STYLE | DOUBLET |
| DIAMETER | 1.186 INCHES NOMINAL |
| EQUIVALENT FOCAL LENGTH | 1.969 INCHES |
| FSC APPLICATION DATA | PERISCOPE,INTEGRATED WITH FIRE CONTROL EQUIPMENT |
| 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 | 1.5725 NOMINAL AND 1.6490 NOMINAL |