Convex-Concave Lenses (N-BK7)
(Meniscus)

^{Meniscus Lenses Negative meniscus lens is a convex-concave lens, but is thinner at the center than at the edges. Otherwise description is similar to Plano concave lense.}

Specifications
Material:                         N-BK7
Diameter tolerance:      +/-0.1mm
Design wavelength:       546.1nm
Focal tolerance:              +/-2%
surface quality :             60-40 S/D
Centration:                     3 arcmin
Surtace flatness:            λ/4 @633nm
Clear aperture:              90%
Bevel:                              Protective bevel