- Parallelism: 30 arc seconds or better
- Size: 50.0 x 50.0 +0.0 / -0.25
- Thickness: 2.84 ±nom
- Scratch-Dig: 80/50
- Clear Aperture: 90%
- Flatness: 0.25 wave per inch or better
- Angle of Incidence: 0
- %T (Optical Density): -
$250.00
$228.00
$190.00
In Stock