Specification :
- Substrate: B270.
- Thickness: 1.85mm.
- FWHM: O37nm+Ha 7nm.
- Blocking range: 300 to 1000nm.
- Blocking depth: light pollution line blocking >99%.
- Surface quality: 60/40.
- Transmitted Wavefront RMS: λ/4.
- Parallelism: 30s.
- Tpeak: T>90
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