NSN 6650-00-768-8771
Part Details | OPTICAL INSTRUMENT LENS
6650-00-768-8771 An unmounted, transparent, color free lens which may be treated with a low reflection coating to increase light transmission. Includes single and compound elements. For items having two plane parallel surfaces, see WINDOW, OPTICAL INSTRUMENT. Excludes RETICLE, OPTICAL INSTRUMENT.
Alternate Parts: 7688771, 6650-00-768-8771, 00-768-8771, 6650007688771, 007688771
| Supply Group (FSG) | NSN Assigned | NIIN | Item Name Code (INC) |
|---|---|---|---|
| 66 | JAN 01, 1962 | 00-768-8771 | 21884 ( LENS, OPTICAL INSTRUMENT ) |
REFERENCE DRAWINGS & PICTURES
DOUBLE CONCAVE
DOUBLE CONCAVE
Cross Reference | NSN 6650-00-768-8771
| Part Number | Cage Code | Manufacturer |
|---|---|---|
| 7688771 | 19200 | US ARMY ARDEC RDECOM |
Technical Data | NSN 6650-00-768-8771
| Characteristic | Specifications |
|---|---|
| SINGLE LENS STYLE | DOUBLE CONCAVE |
| DIAMETER | 1.097 INCHES MINIMUM AND 1.100 INCHES MAXIMUM |
| AXIAL THICKNESS | 0.241 INCHES MINIMUM AND 0.251 INCHES MAXIMUM |
| ELEMENT LEFT SURFACE RADIUS | 2.774 INCHES |
| ELEMENT RIGHT SURFACE RADIUS | 0.860 INCHES |
| EQUIVALENT FOCAL LENGTH | -0.927 INCHES |
| BACK FOCAL LENGTH | -0.961 INCHES |
| REFRACTION INDEX | 1.6890 NOMINAL |
| ABBE CONSTANT | 30.900 |
| SPECIAL FEATURES | LEFT SURFACE EDGE CHAMFER 0.010 TO 0.020 IN. BY 45 DEG. RIGHT SURFACE EDGE CHAMFER 0.050 TO 0.060 IN. BY 45 DEG. BOTH SURFACES COATED WITH MAGNESIUM FLUORIDE. RIM AND CHAMFERS GROUND. |
| FSC APPLICATION DATA | PERISCOPE,TANK |