CONFIGURATION: DISC, PLANO/CONVEX
DIAMETER: 12.70mm + 0.00mm /- 0.10mm
CENTER THICKNESS: 1.12mm REF.ONLY
EDGE THICKNESS: 1.00mm +/- 0.10mm
EDGE BEVEL: LIGHT PROTECTIVE BEVEL, 2 PLACES.
SPHERICAL RADIUS: 170.00mm +/- 0.85mm CONVEX
CENTERING ERROR: 5 ARC MINUTES MAXIMUM.
CLEAR APERTURE: CENTRAL 10.80mm MINIMUM DIAMETER.
SURFACE FINISH: 80-50 PER MIL-PRF-13830, 2 FACES.
SURFACE FIGURE: PLANO: POWER: 20 FRINGES MAXIMUM
IRREG: 10 FRINGES MAXIMUM
SPH.RAD: POWER: SEE RAD.TOLERANCE
IRREG: 10 FRINGES MAXIMUM
MATERIAL TYPE/QUALITY: SAPPHIRE, OPTICAL GRADE.
CRYSTALLOGRAPHIC ORIENTATION: c-PLANE.
COATING: ALUMINUM WITH A PROTECTIVE OVERCOAT
ON THE CONVEX SURFACE. THE PLANO SURFACE
TO REMAIN UNCOATED.