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We supply kinds of plano-convex spherical lens,plano-concave spherical lens,bi-convex spherical lens,bi-concave spherical lens,meniscus spherical lens,special spherical lens,achromatic spherical lens,ball lens,sphere lens etc.

The meniscus lens plays a divergent role in the optical path, and is commonly used in photographic system, objective lens system and laser measuring system.Meniscus Lens can increase the NA of the system while only adding slightly to the total spherical aberrations. The Negative Meniscus Lens is used to increase the focal length of another lens while maintaining the angular resolution of the optical assembly. This lens shape is best used when one conjugate is relatively far from the lens.

Blackening the edges of the lenses will reduce stray-light and increase the singal-to-noise ratio in an optical system.You'll see an improvement in your application. 

Specification of our meniscus spherical lenses as follow:
*Material:Bk7,fused silica,CaF2,MgF2,BaF2,ZnSe and other infrared optical crystals.
*Focal length:+/-1%
*Length tolerance:+0.0 - -0.1mm
*Width tolerance:+0.0 - -0.1mm
*Center thickness tolerance:+/-0.1mm
*Surface Figure:lambda/2 at 633nm on plano side
*Surface quality:20/10,40/20,60/40 stratch/dig
*Clear Apenture>95%
*Chamfer:0.25mm at 45 degree typical
*Coating: BBAR, Reflective coating, dichroic coating,AR coating etc.