- Parallelism: 30 arc seconds or better
- Size: 50.0 Ø +0.0 / -0.25
- Thickness: 2.90 ±nom
- Scratch-Dig: 80/50
- Clear Aperture: 90%
- Flatness: 0.25 wave per inch or better
- Angle of Incidence: 0
- %T (Optical Density): 3.16 ( 1.5 OD )
$234.00
$213.00
$178.00
In Stock