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National Stock Number:
6650-00-768-8777
Federal Supply Class:
6650
National Item Identification Number:
007688777
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:
| 7688777 | 19200 | US ARMY ARDEC RDECOM |
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Techincal Specification:
| ELEMENT RIGHT SURFACE RADIUS | 2.100 INCHES | | ELEMENT LEFT SURFACE RADIUS | 3.100 INCHES | | ABBE CONSTANT | 55.000 | | AXIAL THICKNESS | 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM | | BACK FOCAL LENGTH | 2.449 INCHES | | DIAMETER | 1.297 INCHES MINIMUM AND 1.300 INCHES MAXIMUM | | EQUIVALENT FOCAL LENGTH | 2.501 INCHES | | FSC APPLICATION DATA | PERISCOPE,TANK | | MATERIAL DOCUMENT AND CLASSIFICATION | MIL-G-174, CLASS 1, GRADE D, TYPE 617-550 MIL SPEC SINGLE MATERIAL RESPONSE | | MATERIAL | GLASS OPTICAL | | REFRACTION INDEX | 1.6170 NOMINAL | | SINGLE LENS STYLE | DOUBLE CONVEX | | SPECIAL FEATURES | EDGES CHAMFERED 0.010 TO 0.020 IN. BY 45 DEG. BOTH SURFACES COATED WITH MAGNESIUM FLUORIDE. RIM GROUND. |
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