1. ALL DIMENSIONS ARE IN MILLIMETERS. #OQT@uF!
2. MATERIAL: OPTICAL GLASS PER MIL-G-174 j3Sz+kOf,
TYPE: HZK21 CDGM NO.623581 )K.'sX{B
NP 1.6230 ± V ± 58.2 ~7G@S&<PK(
STRIAE GRADE , ANNEAL Z\\'0yuY(
MELT NO. !_No\O
3. 'P' PITCH POLISH TO TEST PLATE WITHIN QY^v*+lr\
POWER AND IRREGULARITY INDICATED. @@1Sxv_
4. MANUFACTURE PER MIL-O-13830 9'My/A0
5. SURFACE QUALITY NwISf
6. 'C' MAGNESIUM FLUORIDE COATING PER MI ;Y^.SR"
FOR MAX TRANSMISSION AT MILLI x%Fy1.
7. 'G' FINE GROUND & BLACKENED PER r(VGdG
8. BEVEL EDGES AT 45 DEG TO MAX FA fz[-pJ5[
9. DIAMETER TO FLAT IS (REF) tO@n3"O
WITH SURFACE SAG OF ON SURFA