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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.

Specifications:

 Material
 BK7
 Diameter Tolerance
 +0.0/-0.1mm
 Paraxial Focal Length
 ±2%
 Centration
 3 arc minutes
 Surface Figure
 λ/4 @ 633 nm
 Surface Quality
 60/40
 Clear Aperture
 >80%
 Bevel
 
 Coating
 Uncoated
proimages/Products/A-Lenses/A-5-Meniscus_Lenses/pa-05-01.gif