A supplementary lens system for providing at least one supplementary lens in front of a camera module of an electronic device, the supplementary lens system including an object-side lens-element unit with positive refractive power and an image-side lens-element unit with positive refractive power. The object-side lens-element unit and the image-side lens-element unit are configured to generate an intermediate image between the object-side lens-element unit and the image-side lens-element unit. Furthermore, the invention relates to a supplementary lens for such a supplementary lens system.

A supplementary lens system for providing at least one supplementary lens in front of a camera module of an electronic device, the supplementary lens system including an object-side lens-element unit with positive refractive power and an image-side lens-element unit with positive refractive power. The object-side lens-element unit and the image-side lens-element unit are configured to generate an intermediate image between the object-side lens-element unit and the image-side lens-element unit. Furthermore, the invention relates to a supplementary lens for such a supplementary lens system.

A reduction optical system disposed on an image side of a main optical system, a composite focal length of the main optical system and the reduction optical system being shorter than a focal length of the main optical system, includes a first lens element disposed closest to an object side and having a positive refractive power, a second lens element disposed closest to an image side and having a positive refractive power, and a positive lens and a negative lens disposed between the first lens element and the second lens element.

A wide attachment which is detachably attached to an object side of a lens apparatus and in which a focal length of the lens apparatus is shifted to a short focal length side. The wide attachment is formed of a single meniscus lens having a negative refractive power. The lens has an aspherical surface. The following conditional expressions are satisfied: 5.2<(r1+r2)/(r1r2)<1.3, and 1.50<nd<1.53, where r1 represents a curvature radius of a surface on an object side of the lens, r2 represents a curvature radius of a surface on an image side of the lens, and nd represents a refractive index of a material constituting the lens with respect to d-line, wherein a curvature radius of the aspherical surface is defined as a curvature radius of a spherical surface passing through a lens vertex and a maximum effective diameter of the aspherical surface.

A wide attachment which is detachably attached to an object side of a lens apparatus and in which a focal length of the lens apparatus is shifted to a short focal length side. The wide attachment is formed of a single meniscus lens having a negative refractive power. The lens has an aspherical surface. The following conditional expressions are satisfied: 5.2<(r1+r2)/(r1r2)<1.3, and 1.50<nd<1.53, where r1 represents a curvature radius of a surface on an object side of the lens, r2 represents a curvature radius of a surface on an image side of the lens, and nd represents a refractive index of a material constituting the lens with respect to d-line, wherein a curvature radius of the aspherical surface is defined as a curvature radius of a spherical surface passing through a lens vertex and a maximum effective diameter of the aspherical surface.

A mobile terminal according to the present invention comprises: a main body; a camera provided in the main body and comprising first and second lenses, which have different telephoto ratios; and a control unit for correlating, on the basis of a specific subject, a first image captured through the first lens with a second image captured through the second lens, wherein the control unit correlates a first region of the first image, in which a first graphic object corresponding to the specific subject is included, with the second image including a second graphic object corresponding to the specific subject and, to when a preset manner of touching is applied to the first region of the first image in a state in which the first image is outputted on a touch screen, controls the touch screen such that the second image is outputted thereon.

A multi-magnification reflective telescope of an optical system includes a case, a shared primary mirror coupled to the case, and a secondary mirror coupled to the case. The shared primary mirror is configured to expand a beam of electromagnetic radiation and the secondary mirror is configured to direct the beam of electromagnetic radiation to and to receive the target image from the shared primary mirror. The multi-magnification reflective telescope is configured to simultaneously direct the beam of electromagnetic radiation along a laser output path toward a target and to receive a target image along an imaging optical path and to direct the target image to one or more detectors simultaneously.

A multi-magnification reflective telescope of an optical system includes a case, a shared primary mirror coupled to the case, and a secondary mirror coupled to the case. The shared primary mirror is configured to expand a beam of electromagnetic radiation and the secondary mirror is configured to direct the beam of electromagnetic radiation to and to receive the target image from the shared primary mirror. The multi-magnification reflective telescope is configured to simultaneously direct the beam of electromagnetic radiation along a laser output path toward a target and to receive a target image along an imaging optical path and to direct the target image to one or more detectors simultaneously.

An add-on device for an image scanner for scanning barcodes is provided. The add-on device includes a housing mounted to the standard range lens front on an image scanner, and a lens holder. The lens holder has a first position for holding a first lens, a second position being an aperture, and a third position for holding a second lens. A high-density lens is mounted in the first position. An extended range lens is mounted in the third position. The lens holder is mounted in the housing and is transverse to the optical axis of the standard range lens of the image scanner. Further, the lens holder is movable within the housing in order to alternately position the high-density lens, the aperture, and the extended range lens to be in alignment with the optical axis of the standard range lens of the image scanner.

The invention discloses a universal mobile phone lens. The universal mobile phone lens comprises an objective lens module, sleeves, a prism module, a housing module, adjustment grooves and an ocular lens module; the sleeves comprise a first sleeve and a second sleeve; both the first sleeve and the second sleeve are hinged outside the housing module; the objective lens module and the ocular lens module are both installed inside the housing module; the prism module is installed inside the housing module and located between the objective lens module and the ocular lens module; the adjustment grooves are set outside the housing module; a sleeve groove is respectively formed inside the first sleeve and the second sleeve and is functioning with the adjustment grooves; and a stopper nail is arranged on the ocular lens module. According to the present invention, by rotating the first sleeve and the second sleeve, the objective lens module and the ocular lens module can be moved back and forth, and the distance between the ocular lens module and a mobile phone camera may be adjusted to work with different brands and models of mobile phones, henceforth, the device can be used in any kinds of cellphones, even in case of changing cellphones, it is no longer necessary to purchase a new special lens.