Description :

A lens having two spherically curved faces, one convex and the other concave, so that it has the form of a shell. A positive meniscus lens is thicker in the middle than at the edges and serves as a converging lens; a negative meniscus lens thickens toward the edges and works as a diverging lens. Very large telescopes may use meniscus mirrors, which are lightweight and require an active control system to retain their shape against gravity.

Specification :

• Paraxial focal length: ±2.
• Centration: 3 arc minutes.
• Surface figure:?/4 @ 632.8 nm.
• Surface quality: 60/40.
• Clear aperture: >80%.
• Bevel: <0.25mm x 45°.
• Coating: uncoated.

• 
  IR Lenses And UV Lenses
• 
  Double-Convex Lenses (Optical Lenses)
• 
  Plano-convex (PCX) Spherical Lenses (Optical Lenses)
• 
  Achromatic Lenses
• 
  Ball Lenses
• 
  Condenser Lenses
• 
  Fresnel Lenses
• 
  Micro Lenses

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