| ELEMENT LEFT SURFACE RADIUS | 3.266 INCHES |
| ELEMENT RIGHT SURFACE RADIUS | 1.010 INCHES |
| ABBE CONSTANT | 64.500 AND 36.200 |
| AXIAL THICKNESS | 0.740 INCHES NOMINAL AND 0.158 INCHES NOMINAL |
| BACK FOCAL LENGTH | 2.879 INCHES |
| COMPOUND LENS EDGE THICKNESS | 0.557 INCHES NOMINAL |
| COMPOUND LENS OVERALL AXIAL THICKNESS | 0.898 INCHES NOMINAL |
| COMPOUND LENS STYLE | DOUBLET |
| DIAMETER | 1.890 INCHES NOMINAL |
| EQUIVALENT FOCAL LENGTH | 3.141 INCHES |
| FSC APPLICATION DATA | WIGHT 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 | 1.5170 NOMINAL AND 1.6210 NOMINAL |
| WIDTH | 0.694 INCHES NOMINAL |