Abstract: A lens system includes, from an object-side to an image-side, a first lens with positive refractive power, an aperture stop, a second lens with positive refractive power, a third lens with negative refractive power, a color filter, and an image plane. The first lens includes a first surface facing the object-side and a second surface facing the image-side. The second lens includes a third surface facing the object-side and a fourth surface facing the image-side. The imaging lens satisfies the following conditions: 0.26<R1/F1<0.35; and ?0.65<R2/F2<?0.35. Wherein: R1 is a radius of curvature of the first surface; R2 is a radius of curvature of the second surface; F1 is a focal length of the first lens; F2 is a focal length of the second lens.

Abstract: A lens system includes, in order from the object side, a positive refractive power first lens, a negative refractive power second lens, a positive refractive power third lens, and a negative refractive power fourth lens. The lens system satisfies the following conditions: D/L>1.18; and L/T2>14. Wherein, D is the diameter of the effective imaging area of the lens system on the image plane, L is a distance from a surface of the first lens facing the object side of the lens system to the image plane, and T2 is a distance between the two surfaces of the second lens on the optical axis of the lens system.

Abstract: An exemplary super-wide-angle lens includes a lens barrel, a set of imaging lenses, and a prism. The set of imaging lenses is received in the lens barrel. The prism has three light incident surfaces, each of which is coated with a unique color filter for exclusively transmitting a predetermined color light, and a light emissive surface. The prism is positioned such that each of the light incident surfaces is configured for receiving light from a unique field of view of the super-wide-angle lens and the light emissive surface faces the set of imaging lenses, and is structured so that light transmitting in the prism is directed from the light incident surfaces to the light emissive surface.

Abstract: An imaging lens system, in order from the object side to the image side thereof, includes a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power and an image sensing element. The imaging lens system satisfies the following formulas: L/TTL>1.23, and 0.3<G1R1/F1<0.4, where an active surface of the image sensing element is square and only includes effective pixels, and L is the length of one side of the active surface, image sensing element TTL is the distance along an optical axis thereof from the object-side lens surface of the first lens to an imaging plane of the image side, G1R1 is the radius of curvature of the object-side lens surface of the first lens, and F1 is the focal length of the first lens.

Abstract: A lens system includes, in order from the object side, a positive refractive power first lens, a positive refractive power second lens; and a negative refractive power third lens. Wherein the lens system satisfies the following conditions: (1) (|G1R2|?G1R1)/(|G1R2|+G1R1)<0.5; and (2) 0.2<G1R1/F<0.6, wherein, G1R1 is the radius of curvature of a surface of the first lens facing the object side of the lens system, G1R2 is the radius of curvature of the surface of the first lens facing the image side of the lens system, and F is a focal length of the lens system.

Abstract: A lens system includes, in order from the object side, a positive refractive power first lens, a positive refractive power second lens; and a negative refractive power third lens. Wherein the lens system satisfies the following conditions: (1) (|G1R2|?G1R1)/(|G1R2|+G1R1)<0.5; and (2) 0.2<G1R1/F<0.6, wherein, G1R1 is the radius of curvature of a surface of the first lens facing the object side of the lens system, G1R2 is the radius of curvature of the surface of the first lens facing the image side of the lens system, and F is a focal length of the lens system.

Abstract: An imaging lens system, in order from the object side to the image side thereof, includes a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power and an image sensing element. The imaging lens system satisfies the following formulas: L/TTL>1.23, and 0.3<G1R1/F1<0.4, where an active surface of the image sensing element is square and only includes effective pixels, and L is the length of one side of the active surface, image sensing element TTL is the distance along an optical axis thereof from the object-side lens surface of the first lens to an imaging plane of the image side, G1R1 is the radius of curvature of the object-side lens surface of the first lens, and F1 is the focal length of the first lens.

Abstract: A lens system includes a first lens and a second lens formed in turn from an object side to an image side. The lens system satisfies the following conditions: 0.08?D2/D?0.14??(1) 4?h2/z2?12??(2) wherein, D2 is the distance along an optical axis of the lens system from the second surface of the first lens to the third surface of the second lens, D is the distance along an optical axis of the lens system from the first surface of the first lens to fourth surface of the second lens, h2 is the distance from the optical axis of the lens system to the outermost optically effective portion of the second lens surface of the first lens, and z2 is the distance along the optical axis of the lens system from the vertex of the second surface of the first lens to the point of the optical axis where h2 is measured.

Abstract: A lens system includes a first lens and a second lens formed in turn from an object side to an image side. The lens system satisfies the following conditions: 0.08?D2/D?0.14??(1) 4?h2/z2?12??(2) wherein, D2 is the distance along an optical axis of the lens system from the second surface of the first lens to the third surface of the second lens, D is the distance along an optical axis of the lens system from the first surface of the first lens to fourth surface of the second lens, h2 is the distance from the optical axis of the lens system to the outermost optically effective portion of the second lens surface of the first lens, and z2 is the distance along the optical axis of the lens system from the vertex of the second surface of the first lens to the point of the optical axis where h2 is measured.

Abstract: A lens system includes a positive refractive power first lens, a negative refractive power second lens, a positive refractive power third lens, and a negative refractive power fourth lens in that order from the object side of the lens system. Wherein the lens system satisfies the following conditions: (1) D1/D2<1.6; and (2) R2/F1>1.8, wherein, D1 is the effective radius of a surface of the third lens facing the image side of the lens system, D2 is a distance from the top point of a surface to the optical center of the third lens, R2 is the radius of curvature of a surface of the first lens facing the image side of the lens system, and F1 is a focal length of the first lens.

Abstract: An exemplary super-wide-angle lens includes a lens barrel, a set of imaging lenses, and a prism. The set of imaging lenses is received in the lens barrel. The prism has three light incident surfaces, each of which is coated with a unique color filter for exclusively transmitting a predetermined color light, and a light emissive surface. The prism is positioned such that each of the light incident surfaces is configured for receiving light from a unique field of view of the super-wide-angle lens and the light emissive surface faces the set of imaging lenses, and is structured so that light transmitting in the prism is directed from the light incident surfaces to the light emissive surface.