- Parallelism: 30 arc seconds or better
- Size: 50.0 √ò +0 / -0.25
- Thickness: 0.9 ±nom
- Scratch-Dig: 80/50
- Clear Aperture: 90%
- Flatness: 0.25 wave per inch or better
- Angle of Incidence: 0
- %T (Optical Density): -
$234.00
$213.00
$178.00
In Stock