Convex concave lens-Meniscus lens
Positive meniscus lenses are used to decrease the focal length of another lens while maintaining the angular resolution of the optical assembly. These lenses are commonly used to achieve tighter beam focusing when paired with another positive lens.
Negative meniscus lenses are designed to minimize spherical aberration. In combination with another lens, a negative meniscus lens will decrease the NA of the system.
Changchun Yutai Optics Co., Ltd. can customized high quality meniscus lens according to drawing.