Patent ID: 11867889
Assignee: NITTOH INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 4:
5. The lens system according to claim 3,
wherein the fourth lens group includes a cemented lens disposed on the image plane side of the meniscus lens with positive refractive power, and
a radius of curvature Lber of a surface, which is convex on the image plane side, on the image plane side of the meniscus lens with positive refractive power and a radius of curvature B4fr of a surface, which is concave on the object side, on the object side of the cemented lens disposed on the image plane side of the meniscus lens with positive refractive power satisfy a following condition:

1.03≤|Lber/B4fr|≤1.07.