The rear converter lens consists of, in order from an object side: a first lens group that has a positive refractive power; a second lens group that has a negative refractive power; and a third lens group that has a positive refractive power. The first lens group consists of a cemented lens in which a negative lens concave toward the image side and a positive lens convex toward the object side are cemented. The second lens group consists of a cemented lens in which a negative lens concave toward the image side, a positive lens convex toward both sides, and a negative lens concave toward the object side are cemented. The third lens group consists of a cemented lens in which a positive lens convex toward the object side and a negative lens are cemented. The rear converter lens satisfies predetermined Conditional Expressions (1) and (2).

The rear attachment lens has a positive refractive power as a whole, and is attached to an image side of a main lens so as to change a focal length of the whole lens system after attachment to a focal length longer than a focal length of the main lens. The rear attachment lens includes a most object side lens that is a lens which has a negative refractive power and is disposed to be closest to an object side, and a most image side lens that is a lens which has a positive refractive power and is disposed to be closest to the image side.

A device and method for three-dimensional reconstruction of a scene by image analysis is provided. This device comprises an image acquisition device to capture images of the scene, an analysis device to calculate a three-dimensional reconstruction of the scene from at least one image of the scene taken by the image acquisition device, and a projection device to project a first light pattern and a second light pattern, which are complementary, on the examined scene, the first light pattern and the second light pattern being projected along separate projection axes forming a non-zero angle between them, so as to be superimposed while forming a uniform image with homogenous intensity in a projection plane.

A device and method for three-dimensional reconstruction of a scene by image analysis is provided. This device comprises an image acquisition device to capture images of the scene, an analysis device to calculate a three-dimensional reconstruction of the scene from at least one image of the scene taken by the image acquisition device, and a projection device to project a first light pattern and a second light pattern, which are complementary, on the examined scene, the first light pattern and the second light pattern being projected along separate projection axes forming a non-zero angle between them, so as to be superimposed while forming a uniform image with homogenous intensity in a projection plane.

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 teleconverter, comprising: a master lens apparatus-side mount on which a master lens apparatus is mounted, a camera body-side mount on which a camera body is mounted, and a converter lens unit that has a generally negative refracting power for mounting the master lens apparatus thereon to obtain a lens system having a focal length longer than that of the master lens apparatus, wherein: the converter lens unit comprises a first lens group on the master lens apparatus side and a second lens group on the camera body side with an on-axis longest air separation interposed there-between, and does not include any lens group other than the first lens group and the second lens group, the first lens group has positive refracting power, the second lens group has negative refracting power, the first lens group consists of a first lens element having positive refracting power, and the second lens group comprises, in order from an object side to an image side along an optical path, a second lens element having negative refracting power and adjacent to the first lens element, a third lens element having positive refracting power and adjacent to the second lens element, and a fourth lens element having negative refracting power and adjacent to the third lens element, with satisfaction of the following condition (3):
0.04<d12/D<0.3(3)
where d12 is an air separation between the first lens group and the second lens group, and D is an on-axis thickness of the converter lens unit.

A night vision device, comprising a first light-sensitive chip, a first lens group (101), a first display screen, an image processing system and a control system for adjusting an imaging range of the first light-sensitive chip by adjusting times of optical zooming of the first lens group and/or digital zooming of the image processing system. The night vision device further comprises an auxiliary illumination module (103), which comprises an auxiliary light source and a light guiding cavity; the auxiliary light source at least can emit infrared light; a light ray emitted by the auxiliary light source is emitted via the light guiding cavity; the light guiding cavity has a movable adjustment component for adjusting an irradiation range of the emitted light ray in a manual manner or by means of automatic control by the control system; and the irradiation range is adapted to the imaging range of the first light-sensitive chip. The night vision device according to the present invention can improve a night visual range and imaging quality without changing the level of hardware.

A night vision device, comprising a first light-sensitive chip, a first lens group (101), a first display screen, an image processing system and a control system for adjusting an imaging range of the first light-sensitive chip by adjusting times of optical zooming of the first lens group and/or digital zooming of the image processing system. The night vision device further comprises an auxiliary illumination module (103), which comprises an auxiliary light source and a light guiding cavity; the auxiliary light source at least can emit infrared light; a light ray emitted by the auxiliary light source is emitted via the light guiding cavity; the light guiding cavity has a movable adjustment component for adjusting an irradiation range of the emitted light ray in a manual manner or by means of automatic control by the control system; and the irradiation range is adapted to the imaging range of the first light-sensitive chip. The night vision device according to the present invention can improve a night visual range and imaging quality without changing the level of hardware.

The invention relates to an objective for an image recording device for reproducing an image, which is created by a far-optical device. A housing, which is detachably connectable to an eyepiece of the far-optical device, has a greater inner diameter than the exterior diameter of an eyepiece housing. Both an exit pupil of the far-optical device and an entrance pupil of the objective are situated inside the housing. The objective has at least one lens, the optical axis of which is arranged to be parallel to the optical axis of the eyepiece of the far-optical device and to the middle axis of the eyepiece housing.

The invention relates to an objective for an image recording device for reproducing an image, which is created by a far-optical device. A housing, which is detachably connectable to an eyepiece of the far-optical device, has a greater inner diameter than the exterior diameter of an eyepiece housing. Both an exit pupil of the far-optical device and an entrance pupil of the objective are situated inside the housing. The objective has at least one lens, the optical axis of which is arranged to be parallel to the optical axis of the eyepiece of the far-optical device and to the middle axis of the eyepiece housing.