Patent ID: 11914110
Assignee: ZHEJIANG SUNNY OPTICS CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 10:
11. A photographic optical system, sequentially comprising from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens,
wherein,
the first lens has a positive refractive power, an object-side surface thereof is a convex surface, and an image-side surface is a concave surface;
the second lens has a negative refractive power, an object-side surface thereof is a convex surface, and an image-side surface is a concave surface;
the third lens has a refractive power;
the fourth lens has a refractive power;
the fifth lens has a positive refractive power;
the sixth lens has a negative refractive power, and an object-side surface thereof is a concave surface; and
SAG52 is an on-axis distance from an intersection point of an image-side surface of the fifth lens and the optical axis to a vertex of an effective semi-diameter of the image-side surface of the fifth lens, and SAG52 and a center thickness CT5 of the fifth lens on the optical axis satisfy 1<|SAG52/CT5|<1.5;
a spacing distance T56 of the fifth lens and the sixth lens on the optical axis and a spacing distance T23 of the second lens and the third lens on the optical axis satisfy 0.6<T56/T23<1.2.