1. ALL DIMENSIONS ARE IN MILLIMETERS. ;h*K }U
2. MATERIAL: OPTICAL GLASS PER MIL-G-174 I+[>I=ewa
TYPE: HZK21 CDGM NO.623581 -xEXN[\S
NP 1.6230 ± V ± 58.2 MbZJ;,e?
STRIAE GRADE , ANNEAL DVB{2~7 4
MELT NO. 4{rZppm
3. 'P' PITCH POLISH TO TEST PLATE WITHIN HUv/ ~^<
POWER AND IRREGULARITY INDICATED. gy 3i+J
4. MANUFACTURE PER MIL-O-13830 {MCi<7j<?
5. SURFACE QUALITY U |Jo{(Y
6. 'C' MAGNESIUM FLUORIDE COATING PER MI DRp~jW(\y
FOR MAX TRANSMISSION AT MILLI D(AXk8Vub
7. 'G' FINE GROUND & BLACKENED PER ^=RffrlZU
8. BEVEL EDGES AT 45 DEG TO MAX FA O4cr*MCb5
9. DIAMETER TO FLAT IS (REF) Jrti
cK$
WITH SURFACE SAG OF ON SURFA