bi convex lens

Description

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.
Specification of our optical meniscus spherical lens as follow:
*Material BK7,CaF2 crystal,MgF2,Ge,BaF2 lens,ZnSe or other optical materials
*Dimension Tolerance *0.0 - *0.1mm
*Center Thickness +/*0.1mm
*Focal Length Tolerance+/*1%
*Surface Quality:*0/*0
*Surface Figure:lambda/2 at **3nm on plano side
*Clear Aperture >*0%
*Chamfer 0.*5mm at *5 degree typical