58 results about "Small lens" patented technology

The utility model provides a dual-linkage focusing mode lens and camera shooting equipment, and relates to the technical field of optical imaging, the dual-linkage focusing mode lens comprises a manual focusing lens group, an automatic focusing lens group, a manual driving assembly, an automatic driving assembly and a position sensing trigger unit, the manual focusing lens group comprises at least one manual lens group, and the automatic focusing lens group comprises at least one automatic lens group. The automatic focusing lens group comprises at least one automatic lens group, and the manual driving assembly is connected with and manually drives the manual focusing lens group; a motor of the automatic driving assembly is in driving connection with the automatic focusing lens group; when the manual focusing lens group moves to a preset position along the optical axis, the position induction triggering unit is triggered to start the motor to drive the automatic focusing lens group to execute automatic focusing, the manual focusing lens group and the automatic focusing lens group are sequentially arranged along the optical axis, relay type optical path design is achieved, the size of the lens can be reduced, and redundant motion of the focusing lens groups can be avoided; the position sensing trigger unit is triggered to quickly switch the focusing mode, the movement of a single focusing lens group can be accurately controlled, and the focusing precision and speed are improved.

The invention discloses a large-image-plane video small lens and a camera, and relates to the technical field of optical lenses, and the large-image-plane video small lens is provided with an object side and an image side which are oppositely arranged along the optical axis direction. The small video camera with the large image plane comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from the object side to the image side. Wherein the first lens, the second lens, the fourth lens, the fifth lens, the seventh lens and the eighth lens are plastic aspherical lenses, and the third lens and the sixth lens are glass aspherical lenses; the resolution ratio of the large-image-plane video small lens is greater than or equal to 12M, the image plane height of the large-image-plane video small lens is phi, and the total optical length of the large-image-plane video small lens is TTL, 1lt; tTL / phi < = 1.5. The technical effects of large imaging surface, good imaging effect and small size are achieved through arrangement and combination of the eight lenses, material selection, surface type distribution and parameter design of the lenses.

Proposed is a small lens system including a first lens, a second lens, a third lens, and a fourth lens arranged along an optical axis from an object. The iris diaphragm is located between the first lens and the second lens. The first lens has a negative refractive power and includes a surface concave surface on an object side and a convex surface on an image side. The second lens has a positive refractive power and includes convex surfaces on both sides. The third lens has a positive refractive power and includes convex surfaces on both sides. The fourth lens has a negative refractive power and includes concave surfaces on both sides. All surfaces of the first to fourth lenses are aspherical.

The application discloses a middle-wave refrigeration infrared lens, which comprises a first lens, a second lens, a third lens and a fourth lens arranged in sequence along the transmission direction of the optical axis; the first lens and the third lens are both meniscus positive lenses with the convex surface facing the object side; the second lens is a meniscus negative lens with the convex surface facing the object side; the fourth lens is a meniscus negative lens with the convex surface facing the image side; the air gap between the first lens and the second lens is 1 mm; the air gap between the second lens and the third lens is 54 mm; and the air gap between the third lens and the fourth lens is 5 mm; wherein the lens further comprises a reflecting mirror arranged between the second lens and the third lens to change the direction of the optical axis; the lens provided by the application has the advantages of small lens length size, simple structure, large target surface, clear imaging, and the ability to match a 320*256 resolution and a 30 mu m refrigeration type detector; and the application further discloses an imaging device.

The application discloses a lens module and a camera device with the same. The lens module comprises a lens barrel, a movable part and an electromagnetic driving assembly. The lens barrel is internally provided with a containing space. The movable part is used for carrying an image sensor. Part of the movable part used for carrying the image sensor is located below the containing space. The electromagnetic driving assembly comprises a coil and a magnetic body. The electromagnetic driving assembly is arranged below the containing space. The electromagnetic driving assembly drives the movable part to move by generating Lorentz force or magnetic force between a magnetic field generated by energizing the coil and the magnetic body, so as to drive the image sensor to move. According to the lens module of the embodiment of the application, focusing is realized by driving the image sensor to move instead of driving the lens assembly to move, so that the driving force required by the lens module is smaller, the space reserved for the image sensor by the lens module is smaller, and the thickness in the axial direction can be saved.

The invention relates to the field of measuring instruments, and discloses a multifunctional rapid measuring instrument for large and small lenses, which comprises a carriage plate, a damping connecting assembly is arranged at the upper end of the carriage plate, and at least three supporting legs are arranged at the upper end of the damping connecting assembly. Connecting blocks are fixedly welded to the ends, away from the damping connecting assemblies, of the supporting legs, no less than four connecting screws are arranged in the connecting blocks in a penetrating mode, and multi-direction adjusting assemblies are arranged at the upper ends of the connecting blocks. According to the invention, through the collaborative design of an innovative three-stage damping system (composed of a damping pad, a damping column, a damping spring, a limiting block and a buffer pad), a multi-direction adjusting assembly and a quick connecting and disconnecting assembly, the stability and adaptability of equipment in a dynamic operation environment are remarkably improved; a multi-point uniform stress structure and a composite damping mechanism effectively attenuate multi-band vibration in the running process of a vehicle, and high-precision data acquisition of the measuring instrument on a mobile platform (such as an inspection vehicle) is guaranteed.

The utility model provides a high-pixel automatic focusing miniature lens, which comprises a lens main body, a fixing ring sleeved on one side of the surface of the lens main body, a taking assembly arranged on the surface of the fixing ring and comprising an arc-shaped sliding groove, arc-shaped sliding blocks slidably connected to the left side and the right side of the arc-shaped sliding groove, and a connecting belt connected between the two arc-shaped sliding blocks. The multiple limiting assemblies are arranged between the fixing ring and the two arc-shaped sliding blocks correspondingly. According to the high-pixel automatic focusing small lens provided by the utility model, the surface of the lens main body is provided with the fixing ring with the arc-shaped sliding groove, the arc-shaped limiting groove and the communicating groove, and the fixing ring is matched with the two arc-shaped sliding blocks with the arc-shaped limiting blocks and the connecting belt for use; when a user carries the lens main body outdoors for use and carries out replacement operation of the lens main body, the lens main body can be protected by taking the connecting band in the process of taking and disassembling the lens main body, and the lens main body is prevented from falling and being damaged by collision due to misoperation.

The invention relates to a DMS optical lens based on an infrared image, an optical system of the lens is composed of a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged from left to right along a light incident light path, and a diaphragm is arranged on an S1 surface of a lens L1. Wherein the first lens is a biconvex positive lens; the second lens is a plano-concave negative lens; the third lens is a meniscus convex positive lens; the fourth lens is a meniscus convex positive lens. By reasonably distributing the focal power and the surface type of each lens, the central thickness of each lens, the axial distance between the lenses and the like, the design meets the imaging performance requirement of the lens, and meanwhile, the total length of the lens and the radial size of each lens are reduced by adopting the structural form of an all-glass spherical lens, so that the imaging performance of the lens is improved. The purposes of lens group miniaturization and cost reduction are achieved.

This invention discloses an endoscope with a 30° viewing angle, belonging to the field of medical optical imaging. It includes an operating unit and a tube located at the end of the operating unit. A lens module capable of achieving a large field of view and high resolution is disposed at the end of the tube away from the operating unit. The lens module includes a first lens, a steering prism assembly, a filter, a second lens, an aperture stop, a third lens, a fourth lens, a fifth lens, and a sixth lens, arranged sequentially from the object side to the image side within the tube. The steering prism assembly enables optical path steering to form a 30° viewing angle. This 30° viewing angle endoscope achieves a 30° viewing angle through the steering prism assembly. Through the rational combination of optical lenses, it achieves a large field of view and high resolution while ensuring a miniaturized lens size, solving the problems of small field of view, large lens size, and low resolution commonly found in rigid electronic endoscopes.

The application discloses a device and method for measuring deflection cemented lens eccentric distance, which comprises a deflection cemented lens to be measured, a lens tube clamping assembly, an integrating sphere uniform light source, a camera and an auxiliary rotating table. The deflection cemented lens to be measured comprises a deflection prism and a small lens group which are cemented. The lens tube clamping assembly comprises a double-layer lens tube for fixing the deflection cemented lens to be measured. The integrating sphere uniform light source is used to provide uniform light which is converged into a light spot after passing through the deflection cemented lens to be measured. The auxiliary rotating table is used to adjust the camera or the lens tube clamping assembly so that the optical axis of the camera is perpendicular to the top plane of the deflection prism. The distance between the center of the light spot and the center of the small lens group is the eccentric distance of the deflection cemented lens to be measured. The application calculates the deviation between the light spot and the small lens group at the top by means of image recognition, so as to determine the cementing effect of the deflection cemented lens, and greatly improves the assembly efficiency and the yield of the product.

The application provides a kind of array camera-based coastline ship real-time tracking method, which comprises determining the small lens number and the overlapping area of the image data collected between each adjacent small lens according to the small lens distribution of array camera;All ships to be tracked in the small lens are preliminarily labeled rectangular frame TE;Each labeled rectangular frame TE ship forms a detection frame TF, and a set of Box (x, y, w, h) and a set of feature vectors P are obtained;The intersection-over-union (IOU) of the detection frame TF and the rectangular frame TE of the ship to be tracked is compared, and the ship to be tracked with the intersection-over-union (IOU) reaching the set value is tracked;The ship tracking sequence TraceQueue is obtained;The current small lens sends the signal of the ship to be tracked to the corresponding adjacent small lens through socket communication, and continues to track the ship in the adjacent small lens. The position information and the feature vector of the ship are combined to determine whether two targets in different cameras are the same, thereby improving the accuracy of target tracking.

The present application provides a lens driving mechanism and an electronic device with the same. The lens driving mechanism is used to drive a lens unit to move along an optical axis direction, which comprises an outer frame, a base, a lens carrier and a driving assembly. The outer frame is made of plastic material and has an opening. The base is in contact with the outer frame and is fixed with the outer frame. A receiving space is formed between the outer frame and the base. The lens carrier is movably arranged in the receiving space and is used to carry the lens unit. An external light enters the receiving space through the opening of the outer frame and reaches the lens unit. The driving assembly is arranged in the receiving space and is connected with the lens carrier and the outer frame to drive the lens unit to move along the optical axis direction. The lens driving mechanism can greatly reduce the overall size of the lens driving mechanism and effectively reduce the manufacturing cost.

The present application relates to the field of optical telescope technology, and proposes a kind of spectroscopic popular science telescope, including frame body, field lens ocular lens, cemented ocular lens, display screen and ridge prism are connected from top to bottom on frame body respectively;Half house cemented prism is fixedly connected between one side of ridge prism and frame body, and the inside of frame body is connected with light splitting focusing module, and light splitting focusing module includes relay lens large lens, relay lens middle lens and relay lens small lens;Light splitting focusing module is composed of three relay lenses of relay lens large lens, relay lens middle lens and relay lens small lens, and light splitting focusing module is arranged on original observation light path, and original observation light path is divided into the following two ways: one way is observation light path, directly conducted to field lens ocular lens for user naked eye observation;Another way is imaging acquisition light path.Through the above technical scheme, the problem that the existing telescope exists prism observation and imaging light path coincides, sometimes there will be shielding interference, which will affect the user's judgment.

The application relates to an 8M vehicle-mounted front-view main camera, and the optical system of the lens is composed of a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged along the light incident path from left to right; the first lens is a meniscus concave negative lens, the second lens is a meniscus concave negative lens, the third lens is a double-convex positive lens, the fourth lens is a double-convex positive lens, the fifth lens is a negative lens, and the sixth lens is a double-convex positive lens. While realizing the visual perception and recognition function of driving, 8MP imaging is realized, so that the front-view wide-angle camera and the front-view narrow-angle camera can be replaced, a front-view camera module is formed by a single lens, the cost is greatly reduced, and the market popularity is improved. By reasonably distributing the optical power, surface type, center thickness of each lens and the axial distance between the lenses, the total length of the lens and the radial size of each lens are reduced, and the lens group is miniaturized.

The embodiment of the utility model provides a lens module and electronic equipment, relates to the technical field of cameras, and aims to reduce the size of the lens module. The lens module comprises a lens barrel and a plurality of lenses. The plurality of lenses are located in the lens cone, and the lens with the largest radial size in the plurality of lenses is the first lens. The first lens comprises an optical effective part and a non-optical effective part, and the non-optical effective part is arranged on the periphery of the optical effective part in a surrounding mode. The image side surface of the first lens is a convex surface, and the maximum width of the non-optical effective part is 0.2 mm to 0.4 mm. Or, the image side surface of the first lens is a concave surface, and the maximum width of the non-optical effective part is 0.1 mm to 0.2 mm. According to the lens module provided by the embodiment of the invention, aiming at different conditions that the image side surface is a convex surface or a concave surface, the size of the non-optical effective part of the lens with the largest radial size in the lens module is limited and reduced, so that the lens is ensured to be supported during installation, and the size of the radial section of the lens of the lens module can be correspondingly reduced.

The present disclosure is related to an unmanned aerial vehicle-mounted continuous variable-frequency blue-green laser radar for water depth survey, including a blue-green light variable-frequency laser, a laser power supply driver, an encoding motor, a reflective optical wedge, a reflector, a big lens, a small lens, a balanced light detection module, a high-speed laser acquisition processor, an IMU module, an RTK module, a 4G module, a controller, a 4G antenna, a server, a mobile phone terminal and the like according to a characteristic that continuous variable-frequency blue-green laser generates frequency change when encountering a water surface and a water bottom, convolution and fast Fourier transform and a time-frequency correspondence. The laser radar is small in size, light in weight and suitable for an unmanned aerial vehicle to survey a water depth rapidly and precisely, achieves a millimeter-level precision, and realizes 0-10 m water depth survey.

The application relates to a vehicle-mounted front-view binocular camera lens, which comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from left to right along the light path of light incidence. The design of four glass spherical lenses and three glass aspherical lenses is adopted, the optical power is reasonably distributed, the optical system has high definition, more details can be shot, and the recognition accuracy is improved; the first, second and seventh lenses are glass aspherical lenses, which can reduce aberration, improve image quality, reduce the number of lenses and reduce the outer diameter size of the lens. The lens also has the advantages of a large light aperture and good environmental stability.

The invention discloses a small-sized lens and AR glasses, and relates to the technical field of optical lenses, the small-sized lens is provided with an object side and an image side which are oppositely arranged along the optical axis direction, and the small-sized lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from the object side to the image side; the thickness of the first lens is L1, and 0.2 mm < = L1 < = 0.3 mm; the thickness of the second lens is L2, and L2 is larger than or equal to 0.5 mm and smaller than or equal to 0.6 mm. The thickness L3 of the third lens is greater than or equal to 0.2 mm and less than or equal to 0.3 mm; the thickness of the fourth lens is L4, and L4 is larger than or equal to 0.6 mm and smaller than or equal to 0.8 mm. The thickness of the fifth lens is L5, and L5 is larger than or equal to 0.39 mm and smaller than or equal to 0.43 mm. The total optical length of the small lens is TTL, and TTL is less than or equal to 4.1 mm; the pixel of the small lens is greater than or equal to 12MP. By setting the number of the lenses and designing permutation, combination and parameters of the lenses, the technical effect of small size of the lens is achieved while a certain resolution is met.

The invention relates to a five-piece type foresight main camera and an imaging method thereof, the five-piece type foresight main camera comprises an optical system, the optical system is composed of a first lens, a second lens, a balsaming lens group and a fifth lens which are sequentially arranged from left to right along a light incident light path, and the balsaming lens group is composed of a third lens and a fourth lens; the first lens is a meniscus concave negative lens, the second lens is a biconvex positive lens, the third lens is a biconvex positive lens, the fourth lens is a biconcave negative lens, and the fifth lens is a meniscus convex positive lens. The optical lens has the advantages of being good in imaging definition, large in clear aperture, low in tolerance sensitivity and good in high and low temperature stability, scenes in front of a vehicle and far away from the vehicle can be comprehensively monitored, and through reasonable distribution of the focal power and the surface type of each lens, the center thickness of each lens and the axial distance between the lenses, the imaging quality of the vehicle is improved. While the imaging performance requirement of the five-piece lens is met, the total length of the lens and the radial size of each lens are reduced, and the lens group is miniaturized.

The invention relates to the technical field of machine vision, and discloses a fly's-eye lens image sensor array method, which comprises the following steps: step 1, constructing and calibrating a fly's-eye array imaging module which integrates a plurality of groups of small lens units with inclination angles and polarization directions, acquiring spatial positions and optical parameters of the small lens units; and step 2, combining the motion linear velocity of the object to be measured according to the acquired spatial position and optical parameters. According to the technical scheme, the multi-angle small lens array is integrated on the single module, and the multi-dimensional redundant image information of the surface of the to-be-measured object at the same target point can be acquired at the same time in one-time acquisition. The defect that image information collection is incomplete due to the fact that a high-reflection area and a complex contour edge cannot be considered at the same time due to view angle limitation is overcome.

The invention relates to a small-sized handheld motion camera wide-angle lens and a working method thereof, the lens adopts an optical structure of a full-plastic lens, the advantage of aberration correction of an aspherical lens is brought into full play, high-definition imaging is met, the lens outer diameter is smaller, the optical total length is shorter, and miniaturization and low cost of the lens are guaranteed. The field angle of the lens for a 1 / 1. 3 ''imaging target surface is greater than 110 degrees, and the lens has the advantages of high imaging definition, large clear aperture, low tolerance sensitivity, good high and low temperature peak performance and the like, and can shoot a target more comprehensively.

The invention relates to a small day and night dual-purpose optical lens. An optical system of the lens is composed of a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from left to right along a light incident light path. Under the condition that retroflexion caused by aspheric coefficients is not considered, the first lens is a negative meniscus lens, the second lens is a negative meniscus lens, the third lens is a positive meniscus lens, the fourth lens is a biconvex positive lens, the fifth lens is a biconcave negative lens, and the sixth lens is a biconvex positive lens. The third lens is a glass spherical lens, the first lens, the second lens, the fourth lens, the fifth lens and the sixth lens are plastic aspheric lenses, and the fourth lens and the fifth lens form a balsaming lens group. By reasonably distributing the focal power and the surface type of each lens, the central thickness of each lens, the axial distance between the lenses and the like, the imaging performance requirement of the lens is met, the total length of the lens and the radial size of each lens are reduced, and the miniaturization of the lens group is realized.

The utility model relates to a novel rearview mirror structure capable of achieving automatic assembly. The novel rearview mirror structure comprises a small mirror face assembly, a small lens assembly and a small shield assembly. The small mirror surface assembly comprises a heating piece, a mirror surface and a mirror surface supporting plate, the double faces of the heating piece are coated with glue, one face of the heating piece is bonded with the mirror surface, and the other face of the heating piece is bonded with the mirror surface supporting plate. The small lens assembly comprises a steering lamp, a lower lens shell, a steering gear, a lens ring and a substrate; the steering lamp is fixed on the lower mirror shell, and the lower mirror shell, the steering gear and the mirror ring are fixed on the substrate. The small shield assembly comprises a shield, a support and a folding sealing gasket, the shield is fixed on the support, and the folding sealing gasket is arranged between the shield and the support. The small lens assembly is rotationally clamped on the small shield assembly through the rotating bolt to form a rearview mirror half assembly, and the mirror shell and a mirror surface supporting plate in the small mirror surface assembly are clamped on a base plate of the rearview mirror half assembly to form a complete rearview mirror. The components are accurately positioned and precisely matched, the connecting structure is simple and compact, and adjustment, replacement, disassembly and assembly are convenient.

To miniaturize a lens barrel.SOLUTION: A lens barrel includes a first lens, a first barrel that holds the first lens and has a first cam follower, a second lens, a second barrel that holds the second lens, a focus lens, a focus lens frame, an actuator, a third barrel that has a second cam follower, and a cam barrel that has a first cam groove that engages with the first cam follower and a second cam groove that engages with the second cam follower and that is rotatable about an optical axis. When the cam barrel rotates, the first barrel and the third barrel move in the optical axis direction in different trajectories due to the first cam groove and the second cam groove of the cam barrel, the actuator and the focus lens frame move in the optical axis direction with the movement of the third barrel in the optical axis direction, and the focus lens frame is moved in the optical axis direction with respect to the third barrel by the actuator.SELECTED DRAWING: Figure 2

The thermal imaging lens comprises a lens barrel and a plurality of lenses, the plurality of lenses comprise a diaphragm, a second reflector, a small lens and a first reflector, a through hole is dug in the middle of the first reflector, the small lens is arranged on the left side of the through hole, the diaphragm is made of chalcogenide glass or germanium materials, and the second reflector is made of silicon carbide. The first reflector is an aspheric reflector with a concave surface, the second reflector is an aspheric reflector with a convex surface, the concave surface faces the diaphragm and is opposite to the convex surface, and light emitted from the object side and having the wavelength ranging from 8 micrometers to 14 micrometers penetrates through the periphery of the diaphragm to reach the first reflector and then reaches the second reflector through first reflection of the concave surface. And after being reflected for the second time by the convex surface, the light is refracted by the small lens to form an image on the imaging surface, so that the manufacturing cost is low, the imaging quality is good, the function is complete and the cost performance is high.

The invention relates to a large-aperture infrared wide-angle TOF lens and a working method thereof, the lens adopts an optical structure that two glass lenses are matched with three plastic lenses, the advantage of aberration correction of an aspherical lens is fully played, high-definition imaging is met, the lens outer diameter is smaller, the optical total length is shorter, and miniaturization of the lens is guaranteed. Compared with an all-glass system, the glass-plastic hybrid system has lighter system mass and higher optical performance stability compared with an all-plastic system, and meanwhile, the cost is reduced while the glass-plastic hybrid system adapts to the environment. The system can meet the requirement that the relative illumination of an edge view field is over 60 percent. The imaging angle of the lens to an object is greater than 130 degrees, and the lens has the advantages of high imaging definition, large clear aperture, low tolerance sensitivity, good high and low temperature stability and the like, and can monitor a target scene more comprehensively.

The present disclosure provides a small lens which can be easily assembled to an optical component and can reduce reflectance, an optical component, and a method of manufacturing the optical component. A lens according to one embodiment includes: a first surface which is a plane perpendicular to a first axis extending in a first direction and into which light is incident; and a second surface that has a curved surface shape and that emits the light incident on the first surface. The second surface has a plurality of protrusions formed in a stripe shape extending in a second direction intersecting the first direction.

The invention relates to a full-glass fixed-focus optical lens and a working method thereof. The optical lens is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged in the light incidence direction. According to the invention, the focal power and the surface type of each lens, the central thickness of each lens, the axial distance between the lenses and the like are reasonably distributed, the imaging performance requirement of the lens is met, the total length of the lens and the radial size of each lens are reduced, and the miniaturization of the lens group is realized.

The invention relates to a small foresight optical lens and an imaging method, the small foresight optical lens comprises an optical system, the optical system is composed of a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from left to right along a light incident light path, and a diaphragm is located between the second lens and the third lens; the lenses are made of glass and plastic materials, the first lens and the third lens are glass spherical lenses, the second lens, the fourth lens and the fifth lens are plastic aspheric lenses, and the fourth lens and the fifth lens form a balsaming lens group. By reasonably distributing the focal power and the surface type of each lens, the central thickness of each lens, the axial distance between the lenses and the like, the imaging performance requirement of the lens is met, the total length of the lens and the radial size of each lens are reduced, and the miniaturization of the lens group is realized.

An intraocular lens (IOL) has a small, central lens suspended within a pliable housing and, when the housing is filled with liquid, is coaxially aligned with a second small lens embedded in the wall of the housing. The suspension is on a dome- or other-shaped webbing attached to an inner circumference of the wall. When filled with liquid, forces squeezing or pulling the equator of the housing, as with ciliary muscles in the eye, adjust a distance between the lenses in order to adjust focus. Optional haptics may project from points on or above and below the equator. A recess in the posterior hemisphere of the housing can keep cell growth away from an optical axis of the lens system. A third small lens can be embedded in an opposite wall of the housing and coaxially aligned with the other lenses to form a three-lens, ultra-zoom system.