A camera optical lens includes, from an object side to an image side, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, and a fourth lens having a positive refractive power. 2.70≤v1/v4≤4.30, −1.20≤f2/f≤−0.50, −0.80≤f3/f≤−0.30, −10.00≤(R7+R8)/(R7−R8)≤−2.00, and 3.00≤d4/d5≤10.00. f denotes a focal length of the camera optical lens. f2 denotes a focal length of the second lens. f3 denotes a focal length of the third lens. v1 denotes an abbe number of the first lens. v4 denotes an abbe number of the fourth lens. R7 denotes a curvature radius of an object-side surface of the fourth lens. R8 denotes a curvature radius. d4 denotes an on-axis distance. d5 denotes an on-axis thickness of the third lens. The camera optical lens can achieve a good optical performance while being ultra-thin and having a long-focal-length.

Disclosed is an optical system (10) sequentially comprising, from an object side to an image side, a first lens (L1) having a positive refraction power, a second lens (L2), a third lens (L3) and a fourth lens (L4). An image side surface (S8) of the fourth lens (L4) is a concave surface on an optical axis, both an object side surface (S7) and the image side surface (S8) of the fourth lens (L4) are aspheric surfaces, and at least one of the object side surface (S7) and the image side surface (S8) of the fourth lens (L4) has a point of inflexion. The optical system (10) comprises a stop (STO), the stop (STO) being arranged between the object side of the first lens (L1) and the fourth lens (L4), and the optical system (10) satisfies: 0.5<SL/TTL<0.9, and −1<SAG31/CT3<0.

Disclosed is an optical system (10) sequentially comprising, from an object side to an image side, a first lens (L1) having a positive refraction power, a second lens (L2), a third lens (L3) and a fourth lens (L4). An image side surface (S8) of the fourth lens (L4) is a concave surface on an optical axis, both an object side surface (S7) and the image side surface (S8) of the fourth lens (L4) are aspheric surfaces, and at least one of the object side surface (S7) and the image side surface (S8) of the fourth lens (L4) has a point of inflexion. The optical system (10) comprises a stop (STO), the stop (STO) being arranged between the object side of the first lens (L1) and the fourth lens (L4), and the optical system (10) satisfies: 0.5<SL/TTL<0.9, and −1<SAG31/CT3<0.

A scope includes an objective lens system having refractive power, a relay lens system having refractive power, and an eyepiece system having refractive power. The relay lens system includes a first, a second, and a third lens groups. The second lens group includes a II-2-1 lens and a II-2-2 lens, and both of which are cemented. The third lens group includes a II-3-1 lens having a convex surface facing an object side and a II-3-2 lens having a convex surface facing an image side, and both of which are cemented. The second lens group and the third lens group can move along an optical axis to change a magnification of the relay lens system and thereby change a magnification of the scope. The objective lens system, the relay lens system, and the eyepiece system are arranged in order from the object side to the image side along the optical axis.

A scope includes an objective lens system having refractive power, a relay lens system having refractive power, and an eyepiece system having refractive power. The relay lens system includes a first, a second, and a third lens groups. The second lens group includes a II-2-1 lens and a II-2-2 lens, and both of which are cemented. The third lens group includes a II-3-1 lens having a convex surface facing an object side and a II-3-2 lens having a convex surface facing an image side, and both of which are cemented. The second lens group and the third lens group can move along an optical axis to change a magnification of the relay lens system and thereby change a magnification of the scope. The objective lens system, the relay lens system, and the eyepiece system are arranged in order from the object side to the image side along the optical axis.

The present disclosure discloses a camera lens assembly, the camera lens assembly having a total effective focal length f and an entrance pupil diameter EPD, and along an optical axis from an object side to an image side sequentially including a first lens, a second lens, a third lens and a fourth lens, wherein the first lens and the fourth lens have positive refractive powers, an image-side surface of the first lens is a concave surface, and an object-side surface of the fourth lens is a convex surface. In addition, the total effective focal length f and the entrance pupil diameter EPD satisfy: f/EPD≤2.

An optical lens assembly is provided. The optical lens assembly includes first, second, third and fourth lens elements having refracting power arranged along an optical axis in a sequence from a light output side to a light input side. The first lens element is arranged to be a lens element in a fourth order from the light input side to the light output side. The second lens element is arranged to be a lens element in a third order from the light input side to the light output side. The third lens element is arranged to be a lens element in a second order from the light input side to the light output side. The fourth lens element is arranged to be a lens element in a first order from the light input side to the light output side.

An optical lens assembly is provided. The optical lens assembly includes first, second, third and fourth lens elements having refracting power arranged along an optical axis in a sequence from a light output side to a light input side. The first lens element is arranged to be a lens element in a fourth order from the light input side to the light output side. The second lens element is arranged to be a lens element in a third order from the light input side to the light output side. The third lens element is arranged to be a lens element in a second order from the light input side to the light output side. The fourth lens element is arranged to be a lens element in a first order from the light input side to the light output side.

A folded telephoto lens system may include multiple lenses with refractive power and a light path folding element. Light entering the camera through lens(es) on a first path is refracted to the folding element, which changes direction of the light on to a second path with lens(es) that refract the light to form an image plane at a photosensor. At least one of the object side and image side surfaces of at least one of the lens elements may be aspheric. Total track length (TTL) of the lens system may be 14.0 mm or less. The lens system may be configured so that the telephoto ratio (TTL/f) is less than or equal to 1.0. Materials, radii of curvature, shapes, sizes, spacing, and aspheric coefficients of the optical elements may be selected to achieve quality optical performance and high image resolution in a small form factor camera.

A folded telephoto lens system may include multiple lenses with refractive power and a light path folding element. Light entering the camera through lens(es) on a first path is refracted to the folding element, which changes direction of the light on to a second path with lens(es) that refract the light to form an image plane at a photosensor. At least one of the object side and image side surfaces of at least one of the lens elements may be aspheric. Total track length (TTL) of the lens system may be 14.0 mm or less. The lens system may be configured so that the telephoto ratio (TTL/f) is less than or equal to 1.0. Materials, radii of curvature, shapes, sizes, spacing, and aspheric coefficients of the optical elements may be selected to achieve quality optical performance and high image resolution in a small form factor camera.