Part Details | OPTICAL INSTRUMENT LENS
6650-00-520-4253 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: 6650005204253, 1240005204253, 5204253, 6650-00-520-4253, 00-520-4253, 6650005204253, 005204253
| Supply Group (FSG) | NSN Assigned | NIIN | Item Name Code (INC) |
|---|---|---|---|
| 66 | JAN 01, 1963 | 00-520-4253 | 21884 ( LENS, OPTICAL INSTRUMENT ) |
REFERENCE DRAWINGS & PICTURES
DOUBLET
Cross Reference | NSN 6650-00-520-4253
| Part Number | Cage Code | Manufacturer |
|---|---|---|
| 6650005204253 | A00AM | E.C.A ETABLISSEMENT CENTRALDESAPPROVISIONNEMENTS DES FORCES |
| 1240005204253 | A00AM | E.C.A ETABLISSEMENT CENTRALDESAPPROVISIONNEMENTS DES FORCES |
| 5204253 | 19200 | US ARMY ARDEC RDECOM |
Technical Data | NSN 6650-00-520-4253
| Characteristic | Specifications |
|---|---|
| COMPOUND LENS STYLE | DOUBLET |
| INDIVIDUAL LENS STYLE | DOUBLE CONVEX AND MENISCUS DIVERGING |
| DIAMETER | 0.686 INCHES MINIMUM AND 0.689 INCHES MAXIMUM |
| AXIAL THICKNESS | 0.236 INCHES NOMINAL AND 0.024 INCHES NOMINAL |
| COMPOUND LENS OVERALL AXIAL THICKNESS | 0.240 INCHES MINIMUM AND 0.272 INCHES MAXIMUM |
| COMPOUND LENS EDGE THICKNESS | 0.166 INCHES NOMINAL |
| ELEMENT LEFT SURFACE RADIUS | 0.793 INCHES AND -0.595 INCHES |
| ELEMENT RIGHT SURFACE RADIUS | -0.595 INCHES AND -4.220 INCHES |
| EQUIVALENT FOCAL LENGTH | 1.444 INCHES |
| BACK FOCAL LENGTH | 1.281 INCHES |
| REFRACTION INDEX | 1.5411 NOMINAL AND 1.6210 NOMINAL |
| ABBE CONSTANT | B59.900$$B36.200 |
| SPECIAL FEATURES | REFLECTION REDUCING TREATMENT ON FRONT ANDBACK SURFACES,JAN-M-621 |
| FSC APPLICATION DATA | BINOCULAR,M7,M16 |