Abstract: A zoom lens includes a first lens group having positive refractive power, a second lens group having negative refractive power, and a rear group. The second lens group consists of a second sub-first lens group having positive or negative power, and a second sub-second lens group having negative power. The second sub-second lens group consists of, sequentially from the object side toward the image: a positive second-first lens component; a negative second-second lens component; and a negative second-third lens component. During zooming from a short focal length end to a long focal length end, a distance between the first lens group and the second lens group increases, and a distance between the second lens group and the rear group decreases. A part of the second lens group is movable in a direction perpendicular to an optical axis during correction of image blurring.

Abstract: There is provided an imaging lens with excellent optical characteristics which satisfies demand of low profile and low F-number. An imaging lens comprising in order from an object side to an image side, a first lens with positive refractive power having an object-side surface being convex in a paraxial region, a second lens with negative refractive power in a paraxial region, a third lens with negative refractive power having an object-side surface being convex in a paraxial region, a fourth lens having an object-side surface being convex in a paraxial region, a fifth lens with negative refractive power in a paraxial region, and a sixth lens with positive refractive power having an image-side surface being convex in a paraxial region, and predetermined conditional expressions are satisfied.

Abstract: There is provided an imaging lens with excellent optical characteristics which satisfies demand of low profile and low F-number. An imaging lens comprising in order from an object side to an image side, a first lens with positive refractive power having an object-side surface being convex in a paraxial region, a second lens with negative refractive power in a paraxial region, a third lens with negative refractive power having an object-side surface being convex in a paraxial region, a fourth lens having an object-side surface being convex in a paraxial region, a fifth lens with negative refractive power in a paraxial region, and a sixth lens with positive refractive power having an image-side surface being convex in a paraxial region, and predetermined conditional expressions are satisfied.

Abstract: A retina viewing system and method of using the same includes an ophthalmic microscope, a disposable lens attachment, and an electronic control unit (ECU). The microscope has an optical head and a set of internal focusing lenses, the latter providing the microscope with a variable working distance or focal length. The disposable lens attachment includes a resilient body with a proximal end connected to the optical head and a distal end connected to a high-power/high-diopter distal lens. The ECU executes instructions for viewing a retina or other intraocular anatomy of a patient eye. Execution of the instructions causes the ECU to automatically adjust the variable working distance or focal length of the microscope when viewing an image of the retina through the distal lens.

Abstract: A camera optical lens is provided and includes, from an object side to an image side, a first lens and a second lens that have positive refractive power, a third lens, a fourth lens, a fifth lens, a sixth lens having a positive refractive power, a seventh lens having a negative refractive power, an eighth lens having a positive refractive power, and a ninth lens having a negative refractive power. The camera optical lens satisfies: 3.80?f1/f?7.50; and 3.00?d9/d10?12.00, where f denotes a focal length of the camera optical lens, f1 denotes a focal length of the first lens, d9 denotes an on-axis thickness of the fifth lens, and d10 denotes an on-axis distance from an image side surface of the fifth lens to an object side surface of the sixth lens. The camera optical lens meets design requirements for large aperture, wide angle and ultra-thinness while having good optical performance.

Abstract: A camera optical lens includes first to sixth lenses from object side to image side, with first, third and sixth lenses having negative refractive power and second and fourth lenses having positive refractive power, and satisfies: ?3.00?f1/f??1.50; 1.50?d4/d6?4.00; and R7/R8??8.00, where f and f1 denotes respectively focal lengths of the camera optical lens and the first lens, R7 denotes a curvature radius of an object side surface of the fourth lens, R8 denotes a curvature radius of an image side surface of the fourth lens, d4 denotes an on-axis distance from an image side surface of the second lens to an object side surface of the third lens, and d6 denotes an on-axis distance from an image side surface of the third lens to the object side surface of the fourth lens, thereby meeting requirements of a large aperture, a wide angle, and ultra-thinness while having good optical performance.

Abstract: The present disclosure relates to an optical lens and discloses a camera optical lens. The camera optical lens includes, from an object side to an image side: a first lens with a negative refractive power, a second lens with a positive refractive power, a third lens with a positive refractive power, a fourth lens with a negative refractive power, a fifth lens with a positive refractive power, and a sixth lens with a negative refractive power. The camera optical lens satisfies: 65.00?v3?95.00; R2/R1??2.00; ?10.00?f4/f5??2.00; wherein, v3 denotes an abbe number of the third lens; f4 denotes a focal length of the fourth lens; f5 denotes a focal length of the fifth lens; R1 denotes a central curvature radius of an object-side surface of the first lens; and R2 denotes a central curvature radius of an image-side surface of the first lens.

Abstract: An image forming optical system consists of a first optical system and a second optical system in order from a magnification side. An intermediate image is formed between the first optical system and the second optical system. Among the aspherical lenses included in the first optical system, a specific lens, which is the aspherical lens closest to the intermediate image on the optical path, has a meniscus shape of which a surface is convex toward the reduction side in a paraxial region. The image forming optical system satisfies a maximum image height, a focal length, and predetermined conditional expressions for the specific lens.

Abstract: Provided is a camera optical lens, which includes a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, a fifth lens having a positive refractive power, and a sixth lens having a negative refractive power. The camera optical lens satisfies ?10.00?f1/f??4.00, 0.40?f5/f?0.70, and 8.00?d5/d6?15.00, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f5 denotes a focal length of the fifth lens; d5 denotes an on-axis thickness of the third lens; and d6 denotes an on-axis distance from an image side surface of the third lens to an object side surface of the fourth lens. The camera optical lens has good optical performance and satisfies design requirements for ultra-thin, wide-angle lenses having large apertures.

Abstract: An optical imaging lens, in order from an object side to an image side along an optical axis, includes a first lens having negative refractive power; a second lens; a third lens cemented with the second lens to form a first compound lens having negative refractive power; a fourth lens having positive refractive power; a fifth lens; a sixth lens cemented with the fifth lens to form a second compound lens having positive refractive power; a seventh lens having positive refractive power. The optical imaging lens could provide a better optical performance of high image quality and low distortion.

Abstract: A relay optical system (RL) of this telescope has arranged therein, in the following order from the object side: a first lens group (G1) having positive refractive power; a second lens group (G2) having positive refractive power; a third lens group (G3) having positive refractive power; a fourth lens group (G4) having negative refractive power; and a fifth lens group (G5) having positive refractive power, wherein the magnification of the telescope can be changed by causing an image formed on a first image plane (IM1) to be re-formed on a second image plane (IM2) and further causing the second lens group (G2) and the third lens group (G3) to move along the optical axis, and thereby varying the image-forming magnification of the relay optical system (RL).

Abstract: A camera optical lens includes successively from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The camera optical lens satisfies 58.00?v1?82.00; 2.30?R5/R6; and 0.80?d8/d10?1.20, where v1 denotes an abbe number of the first lens, R5 denotes a curvature radius of an object side surface of the third lens, R6 denotes a curvature radius of an image side surface of the third lens, d8 denotes an on-axis distance from an image side surface of the fourth lens to an object side surface of the fifth lens, and d10 denotes an on-axis distance from an image side surface of the fifth lens to an object side surface of the sixth lens. The camera optical lens meets design requirements of a large aperture, a wide angle, and ultra-thinness while having good optical performance.

Abstract: An optical imaging lens may include a first, a second, a third, a fourth, a fifth, and a sixth lens elements positioned in an order from an object side to an image side. Through designing concave and/or convex surfaces of the six lens elements, the improved optical imaging lens may provide better imaging quality while the length of the lens may be shortened, the F-number may be reduced, and the field of view may be extended.

Abstract: There is provided an imaging lens and an imaging device with a wide angle of view capable of forming an image of an object near an optical axis with a high resolution while having a small size as a whole. The imaging lens is an imaging lens including a first lens G1 having a convex surface on an object side and having a negative refractive power, a second lens G2 having a concave surface on an object side, a third lens G3, a fourth lens G4, a fifth lens G5, and a sixth lens G6, which are sequentially arranged from the object side, and satisfies a predetermined condition. Further, an imaging device according to the present invention includes the imaging lens.

Abstract: The present invention provides a camera lens which is constituted by six lenses and has a narrow angle and good optical characteristics when shooting and a low height when retracted. The camera lens, includes, from an object side, a first lens having a positive refractive power; a second lens a having negative refractive power; a third lens having a positive refractive power; a fourth lens having a negative refractive power; a fifth lens having a negative refractive power; and a sixth lens having a positive refractive power, and satisfies given relational formulas.

Abstract: A wide-angle lens assembly includes a first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, and tenth lenses. The first and second lenses are meniscus lenses with negative refractive power. The third and ninth lenses are with negative refractive power. The fourth lens is with refractive power and includes a concave surface facing an object side. The fifth, sixth, and eighth lenses are with positive refractive power. The seventh lens is with refractive power and includes a concave surface facing the object side. The tenth lens is with refractive power and includes a concave surface facing an image side. The wide-angle lens assembly satisfies: 6<f5/f<8.5; wherein f5 is an effective focal length in mm of the fifth lens and f is an effective focal length in mm of the wide-angle lens assembly.