1. ALL DIMENSIONS ARE IN MILLIMETERS. Z9"{f)T
2. MATERIAL: OPTICAL GLASS PER MIL-G-174 KO-Zz&2f
TYPE: HZK21 CDGM NO.623581 Zc4(tf9
NP 1.6230 ± V ± 58.2 8sR
STRIAE GRADE , ANNEAL Pu$kj"|q*[
MELT NO. co<2e#p;
3. 'P' PITCH POLISH TO TEST PLATE WITHIN 8g[(nxI~
POWER AND IRREGULARITY INDICATED. F8uRT&m B0
4. MANUFACTURE PER MIL-O-13830 6`DwEs?Y{
5. SURFACE QUALITY qD(fYOX{C
6. 'C' MAGNESIUM FLUORIDE COATING PER MI $_ix6z
FOR MAX TRANSMISSION AT MILLI 4T==A#Z
7. 'G' FINE GROUND & BLACKENED PER C`NBHRa>
8. BEVEL EDGES AT 45 DEG TO MAX FA PG^j}
9. DIAMETER TO FLAT IS (REF) '<?v:pb9
WITH SURFACE SAG OF ON SURFA