337 results about "Telephoto lens" patented technology

A camera phone includes a phone stage for generating voice signals, a first image sensor for generating a first sensor output, a first fixed focal length wide angle lens for forming a first image of the scene on the first image sensor, a second image sensor for generating a second sensor output, and a second fixed focal length telephoto lens pointing in the same direction as the first lens and forming a second image of the same scene on the second image sensor. A control element selects either the first sensor output from the first image sensor or the second sensor output from the second image sensor. A processing section produces the output image signals from the selected sensor output, and a cellular stage processes the image and voice signals for transmission over a cellular network.

A method and system for measurement of ground based vehicle speed includes a movable platform that includes an unmanned aerial vehicle (UAV) located in proximity to a roadway, the UAV operates under control and navigation of a UAV control unit, and the UAV also carries camera and monitoring equipment, the camera and monitoring equipment including an onboard computing system, and a camera with a wide angle lens and a camera with a telephoto lens, the cameras being mounted on a pan/tilt device. An algorithm operated by the on-board computing system is used to detect and track vehicles moving on a roadway. The algorithm is configured to detect and track the vehicles despite motion created by movement of the UAV. The cameras mounted on the pan/tilt device are moved under the direction of the computer vision algorithm to maintain a target vehicle of the detected moving vehicles in view, and the speed of the target vehicle is measured.

A compact telephoto lens system that may be used in a small form factor cameras. The lens system may include five lens elements with refractive power. Alternatively, the lens system may include four lens elements with refractive power. At least one of the object side and image side surfaces of at least one of the lens elements is aspheric. Total track length (TTL) of the lens system may be 6.0 mm or less. Focal length f of the lens system may be at or about 7.0 mm (for example, within a range of 6.5-7.5 mm). Lens elements are selected and configured so that the telephoto ratio (TTL/f) satisfies the relation 0.74<TTL/f<1.0. Materials, radii of curvature, shapes, sizes, spacing, and aspheric coefficients of the lens elements may be selected to achieve quality optical performance and high image resolution in a small form factor telephoto camera.

An intermediate telephoto lens system includes a positive front lens group, a variable-aperture diaphragm, and a positive rear lens group, in this order from the object.

The positive front lens group includes a positive first lens element L1, a positive second lens element L2 and a negative third lens element L3, in this order from the object.

The positive rear lens group includes cemented lens elements having a negative fourth lens element L4 and a positive fifth lens element L5, and a positive sixth lens element L6, in this order from the object.

The intermediate telephoto lens system satisfies the following condition:

2.0<f/f₁₂<3.0   (1)

• • wherein
  • f designates the focal length of the entire intermediate telephoto lens system; and
  • f₁₂ designates the combined focal length of the positive first lens element L1 and the positive second lens element L2.

A multifocal lens system to be used for digital cameras for setting any one of a plurality of lenses in a picture taking (image capturing) position comprising a wide-angle lens (shorter focal length lens) mounted in front of an image sensor in a picture taking (image capturing) position, a telephoto lens (longer focal length lens) mounted alongside the wide-angle lens, a parallelogram prism (rhombic prism) or a pair of triangular prisms removably arranged between the two lenses at the rear of them. When the wide-angle lens is to be used, the parallelogram prism or one of the two triangular prisms is to be removed from the rear of wide-angle lens so that the wide-angle lens can be focused on the sensor enabling light to pass therethrough. The telephoto lens is so positioned that it may be focused on the image sensor through the parallelogram prism or being reflected by the triangular prisms enabling light to pass therethrough when a part of the parallelogram prism or one of the two triangular prisms is placed in front of the image sensor to cover the imaging area of the sensor and to shut the light through the wide-angle lens to the sensor. By moving the prism from the rear of each lens, one of the two lenses can be positioned for picture taking (image capturing).

A telephoto lens unit (1) having a lens barrel that supports a telephoto lens and capable of being mounted on and dismounted from a camera body (16) comprises a front lens barrel section (11) that supports the telephoto lens with the subject side defined as the front, and a rear lens barrel section (13) that can be mounted on and dismounted from the front lens barrel section. The distance from the image-most surface of the telephoto lens to the image formation plane of the telephoto lens is kept sufficiently long. Converter lens units (12, 14) for elongating or shortening the focal distance are mounted on the front lens barrel section (11) instead of the rear lens barrel section (13) to provide interchangeable telephoto lenses for a camera having different focal lengths. Also, an erecting prism unit (15) and an eyepiece unit (17) can be connected instead of the rear lens barrel section to enable the telephoto lens to function as a terrestrial telescope.

Provided is a telephoto lens system. The telephoto lens system includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power, which are arranged sequentially from an object side to an image side. Focusing is performed by moving the second lens group along an optical axis. The first lens group comprises (from object to image side) a positive lens having an object side surface whose radius of curvature is greater than that of an image side surface, a positive meniscus lens having a convex surface at the object side, a negative meniscus lens having a convex surface at the object side, and a positive lens having an object side surface whose radius of curvature is greater than that of an image side surface. The second lens group comprises (from object to image side) a doublet lens made up of a positive lens and a negative lens, and the third lens group comprises a doublet lens made up of a negative lens with a concave surface at the object side and a positive lens, and a positive lens.

A telephoto lens system includes a positive first lens group, a positive second lens group, a diaphragm, a negative third lens group constituting a focusing lens group, and a positive fourth lens group.

The first lens group includes a positive first lens element, a positive second lens element, and a negative third lens element. The second lens group includes a negative or a positive fourth lens element and a positive or negative fifth lens element which are cemented to each other. The third lens group includes a positive or negative sixth lens element and a negative or positive seventh lens element which are cemented to each other. The fourth lens group includes one positive eighth lens element. Upon focusing on an object at infinity to an object at a closer distance, the third lens group is moved toward the image. The telephoto lens system satisfies the following conditions:

1.4<f/f1<1.8   (1)

2.4<f/f12<3.0   (2)

−5.5<f/f3<−3.5   (3)

• • wherein f: a focal length of the telephoto lens system; f1: the focal length of the first lens group; f12: the combined focal length of the first lens group and the second lens groups; and f3: a focal length of the third lens group.

An image capturing apparatus and an image smooth zooming method thereof are provided. The image capturing apparatus includes a wide-angle lens and a telephoto lens having different sizes of field of view (FOV). In the method, a wide-view image and a tele-view image are respectively captured by using the wide-angle lens and the telephoto lens according to a zoom scale in a capturing setting. Ratios of the FOV sizes of the wide-angle lens and the telephoto lens to the zoom scale are respectively calculated and used to zoom the captured wide-view image and tele-view image so as to fit the zoom scale. The zoomed wide-view image and tele-view image are aligned according to a shift between view centers of the wide-angle lens and the telephoto lens. Finally, the zoomed and aligned wide-view image and tele-view image are overlapped to output an overlapped image fitting the zoom scale.

An inverse telephoto with correction lenses comprises five lens elements with refractive power, from the object side to the image side: a first lens element with negative refractive power having a concave image-side surface; a second lens element with positive refractive power having a convex image-side surface; a third lens element with a convex object-side surface; a fourth lens element with a concave image-side surface; a fifth lens element with positive refractive power having a convex image-side surface, at least one of an object-side surface and the image-side surface of the fifth lens element being aspheric; and an aperture stop located between the first lens element and the second lens element. At least three of the surfaces of the first, second, third, fourth and fifth lens elements are aspheric.

The invention discloses a telephoto lens. The telephoto lens sequentially comprises a first lens with positive focal power, a second lens with focal power, a third lens with focal power, a fourth lens with focal power, a fifth lens with focal power and a sixth lens with focal power from the object side to the image side, wherein the object side face of the first lens is a convex face, the object side face of the fifth lens is a concave face, the object side face of the sixth lens is a concave face at a near-axis portion, the image side face of the sixth lens is a convex face at the near-axis portion, and the telephoto lens satisfies formulas as follows, 0.75<TTL/f<1.0 and ImgH/f<0.55, the TTL is an axial distance of the first lens from the object side face to an imaging face, the f is an effective focal length of the telephoto lens, and the ImgH is a half of length of a diagonal line of an effective pixel area of the imaging face. Through the telephoto lens, long focal length characteristics can be guaranteed, the relatively small visual field angle and relatively long focal length are realized, shortening the system length of the telephoto lens is facilitated, and miniaturization of the telephoto lens is realized.

A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system according to the present invention comprises: a positive lens unit that is arranged on an object side relative to the aperture diaphragm; a negative lens unit that is arranged on an image side relative to the positive lens unit and on an object side relative to the aperture diaphragm; and a focusing lens unit that is arranged in an optical path between the negative lens unit and the aperture diaphragm. The zoom lens system satisfies the condition (4): 1.20<β_NT/β_NW<4.50 (here, f_T/f_W>3.0, β_NT(β_NW): a composite focal length of the focusing lens unit and the negative lens unit in an infinity in-focus condition at a telephoto (wide-angle) limit when the focusing lens unit has negative optical power, or a lateral magnification of the negative lens unit at a telephoto limit in an infinity in-focus condition when the focusing lens unit has positive optical power, f_T: a focal length of the entire system at a telephoto limit, f_W: a focal length of the entire system at a wide-angle limit.

The invention relates to the field of camera shooting equipment, in particular to a dual-lens camera shooting machine. According to the technical scheme, the dual-lens camera shooting machine comprises a wide-angle lens, the wide-angle lens is fixedly connected to a first bearing part, and dual-lens camera shooting machine is further provided with a telephoto lens which is connected to the first bearing part through a second bearing part, and both the first bearing part and the second bearing part can rotate in the vertical direction and the horizontal direction. The technical purpose is to provide the dual-lens dome-shaped camera shooting machine, both the wide-angle lens and the telephoto lens can rotate on a cloud deck, the range of a monitored picture is further enlarged, zooming tracking of a monitored object is also guaranteed, and the wide-angle lens and the telephoto lens are independent and do not interfere with each other.

The embodiment of the invention discloses a dual-camera shooting method and apparatus, a storage medium and a terminal. The method comprises the following steps: firstly determining a shooting main body in a preview image; secondly, tracking the shooting main body by using a telephoto lens to obtain first displacement information of the shooting main body; then, performing motion compensation on the telephoto lens according to the first displacement information; and finally, when a shooting instruction is triggered, obtaining a long-focus image according to the telephoto lens subjected to themotion compensation, and obtaining a wide-angle image according to the wide-angle lens; and generating a target image according to the long-focus image and the wide-angle image. The motion compensation can be performed on the telephoto lens, the target image is generated according to the wide-angle image obtained by the wide-angle lens and the obtained by the motion compensation, therefore dual-camera motion compensation is achieved, and the shooting image quality is improved.

A catadioptric telephoto lens system which: receives incident light rays in a parallel path of both catoptrics and dioptrics, where some of the incident light rays go through a reflective path involving mirrors/reflective surfaces and others of the incident light rays go through a refractive path involving lenses; or receives incident light rays in a serial path of catoptrics and dioptrics, where all the incident light rays initially go through a reflective path involving mirrors/reflective surfaces and then go through a refractive path involving lenses. The system eliminates the black pupil/iris blur disadvantages associated with conventional telescopic lens systems and may be provided in a very compact form.

Disclosed is a ball head for a camera tripod. The movement of the ball head is finely adjusted in front, rear, left, and right directions through mechanical manipulation. Since a conventional ball head is mounted with a ball on a tripod, after a user releases the ball head from the pressure and freely adjusts the ball head in front, rear, left, and right directions by a hand, the user fastens a knob of fixing the ball to press the ball so that a lower plate of supporting the ball tightens the ball to fix the ball. Such a conventional ball head has disadvantages in that the user has to release the pressure applied to the ball by unfastening the knob and then finely adjust a photographing angle to a desired degree by using the hand when the repeated fine adjustment of the photographing angle is required in a state that the heavy telescope lens or photographing appliances is mounted on the tripod after the photographing angle has been primarily adjusted by the hand of the user. The accurate adjustment to a desired photographing angle is significantly difficult due to the heavy weight of the telephoto lens or the photographing appliances. The angle adjustment is repeatedly achieved through mechanical manipulation.

The purpose is to provide a large-aperture-ratio internal focusing telephoto lens applicable to a wider photographing area by equipping a vibration reduction function capable to satisfactorily correct a camera shake and the like with securing superb optical performance. The large-aperture-ratio internal focusing telephoto lens includes, in order from an object, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. The second lens group G2 is moved along an optical axis upon changing focus from infinity to a close-range object. The first lens group G1 has at least two cemented lenses and satisfies a given conditional expression. Either one of the cemented lens satisfies a given conditional expression.

The invention relates to a photoelectric microscopic imaging system, which is used for acquiring the digital image information of moving particles in oil. The system is characterized by adopting double fiber-coupling LED-based transmission and reflecting light sources of two colors to optically amplify and image the moving particle objects in the flowing oil by a telephoto lens component and then acquire the digital image information, such as surface colors, profiles, sizes, porosity factors and the like, of the particle objects by a high-speed digital charge coupled device for analysis on the types, number and size distribution of the particles in the oil to further determine the mechanical wear condition and an oil particle pollution degree in a sealed oil oil-way system. The system is applied to mechanical condition monitoring and failure diagnosis in the fields of aviation, ships, railways and the like.