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National Stock Number:
6650-00-768-8771
Federal Supply Class:
6650
National Item Identification Number:
007688771
Description:
LENS,OPTICAL INSTRUMENT
Detail:
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.
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Manufacturer Information:
| 7688771 | 19200 | US ARMY ARDEC RDECOM |
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Techincal Specification:
| ELEMENT RIGHT SURFACE RADIUS | 0.860 INCHES | | ELEMENT LEFT SURFACE RADIUS | 2.774 INCHES | | ABBE CONSTANT | 30.900 | | AXIAL THICKNESS | 0.241 INCHES MINIMUM AND 0.251 INCHES MAXIMUM | | BACK FOCAL LENGTH | -0.961 INCHES | | DIAMETER | 1.097 INCHES MINIMUM AND 1.100 INCHES MAXIMUM | | EQUIVALENT FOCAL LENGTH | -0.927 INCHES | | FSC APPLICATION DATA | PERISCOPE,TANK | | MATERIAL DOCUMENT AND CLASSIFICATION | MIL-G-174, GRADE C, TYPE 689-309 MIL SPEC SINGLE MATERIAL RESPONSE | | MATERIAL | GLASS OPTICAL | | REFRACTION INDEX | 1.6890 NOMINAL | | SINGLE LENS STYLE | DOUBLE CONCAVE | | 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. |
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