Materials: High quality optical glass

   Focal length: ±2%@587.6nm s

   Diameter Tolerance: +0.0/-0.20

   Center Thickness: ±0.1

    Center deviation: 3′

   Diaphragm: 1~5

   Irregularity: 0.2~0.5

   Clearing: IV stand

   Coating: MgF2 antireflection film

   Aperture: >90%ø