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National Stock Number:
6650-00-768-8718
Federal Supply Class:
6650
National Item Identification Number:
007688718
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:
| 7688718 | 19200 | US ARMY ARDEC RDECOM |
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Techincal Specification:
| ELEMENT RIGHT SURFACE RADIUS | 1.087 INCHES | | ELEMENT LEFT SURFACE RADIUS | 1.575 INCHES | | ABBE CONSTANT | 63.500 AND 29.300 | | AXIAL THICKNESS | 0.108 INCHES MINIMUM AND 0.128 INCHES MAXIMUM AND 0.384 INCHES MINIMUM AND 0.404 INCHES MAXIMUM | | COMPOUND LENS EDGE THICKNESS | 0.469 INCHES NOMINAL | | COMPOUND LENS OVERALL AXIAL THICKNESS | 0.492 INCHES MINIMUM AND 0.532 INCHES MAXIMUM | | COMPOUND LENS STYLE | DOUBLET | | DIAMETER | 1.062 INCHES MINIMUM AND 1.065 INCHES MAXIMUM | | EQUIVALENT FOCAL LENGTH | 35.620 INCHES | | FSC APPLICATION DATA | PERISCOPE,TANK | | INDIVIDUAL LENS STYLE | DOUBLE CONVEX AND DOUBLE CONCAVE | | MATERIAL DOCUMENT AND CLASSIFICATION | MIL-G-174,CLASS 1,GRADE C,TYPE 511-635 MIL SPEC 1ST MATERIAL RESPONSE AND MIL-G-174,CLASS 1,GRADE C,TYPE 720-293 MIL SPEC 2ND MATERIAL RESPONSE | | MATERIAL | GLASS OPTICAL | | REFRACTION INDEX | 1.5110 NOMINAL AND 1.7200 NOMINAL | | SPECIAL FEATURES | FRONT AND BACK SURFACES COATED WITH MAGNESIUM FLUORIDE. ALL EDGES CHAMFERED 0.020 IN. MIN. BY 45 DEG. RIM AND CHAMFERS GROUND. |
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