| GENERAL CHARACTERISTICS ITEM DESCRIPTION | FRONT AND REAR SURFACES TO BE COATED WITH A 3 LAYER,HIGH EFFICIENCY ANTI-REFLECTIVE COATING AS PRODUCED BY OPTICAL COATING LABORATORY INC.,OR EQUIVALENT IN ACCORDANCE WITH MIL-C-675 EXCEPT THAT THE FOLLOWING TOERANCES APPLY; 0 DEG ANGLE OF INCIDENCE-FOR 450 TO 675 MILLIMICRONS,REFLECTANCE TO BE 0.6 PCT ABSOLUTE-FOR 425 TO 700 MILLIMICRONS,REFLECTANCE TO BE 0.5 PCT AVERAGE; 30 DEG ANGLE OF INCIDENCE-FOR 450 TO 625 MILLIMICRONS,REFLECTANCE TO BE 1.0 PCT ABSOLUTE-FOR 425 TO 700 MILLIMICRONS,REFLECTANCE TO BE 0.5 PCT AVERAGE: SIZE IN IN.,2.980 TO 2.995 DIAM,THICKNESS 0.125 PORM 0.016 |