• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Low-cost folding telephoto lens comprising a foldable parabolic cover (1) coated on the inside of a smooth material of high reflectivity and uniform color (9), and an adapter (5) for fixing an image acquisition system joined by a elongated and straight central support (2). The geometry of the set makes it possible to capture distant images capturing more light than with conventional refractive telephoto lenses. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2684492A1
    申请号:ES201730502
    申请日:2017-03-30
    公开日:2018-10-03
    发明作者:David MIRAUT ANDRES；Jose Javier San Martin Lopez
    申请人:Universidad Rey Juan Carlos；
    IPC主号:
    专利说明:

    DESCRIPTION
    LOW COST FOLDABLE TELEOBJECTIVE
    SECTOR OF THE TECHNIQUE
    The present invention falls within the technical area of optical devices that improve the performance of digital cameras. Specifically, the one that concerns those with which a magnification is obtained with a precise focus (typically known as telephoto lenses).
    10 BACKGROUND OF THE INVENTION
    Refractive telephoto lenses are widely used to take photographs of objects at a great distance (for example, wildlife or sporting events).
    This is possible because the focal length of this type of lens is noticeably greater than that of our eyes and, therefore, the field of vision is smaller and the resulting framing allows magnifying very specific parts of the image that we capture with the naked eye. .
    The technology of this type of optical instruments has advanced a lot in recent years. However, there are a set of physical limitations difficult to overcome.
    Since the solid angle that is captured is small, so is the amount of energy in the form of electromagnetic radiation that penetrates through the telephoto aperture and that, after crossing the optical elements of the camera, reaches the surface of the sensor.
    This fact requires the use of large diameter lenses to increase the amount of light that enters, as well as special materials (such as fluorite, CaF2) that have better properties (such as lower absorption and dispersion) that allow reducing the number of lenses needed to compensate for the optical aberrations, so that the assembly has greater luminosity.
    These types of design strategies significantly increase the cost of manufacturing and, therefore, are only available to the most demanding professionals, willing to spend a large amount of money. Therefore, most telephoto lenses
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    that an average user can acquire are not very bright, having lenses of a size and more common materials.
    The effect of focal length on depth of field is inversely proportional. However, due to the problems of luminosity, the photographer is often forced to open the diaphragm to the maximum to increase the amount of light that enters the telephoto lens, which has the consequence that the depth of field is drastically reduced, reaching to blur the background completely in combination with wide open diaphragms, creating an effect known as bokeh. Although it is an artistic resource widely used in photography to give relevance to certain objects on the scene, in the professional sector to which telephoto lenses are directed, the blurring produced is usually more a nuisance than a desired effect.
    From a greater focal length a flatter image is also obtained, that is, all objects appear to be at the same distance, losing the three-dimensional sensation, except for the above-mentioned bokeh effect. It should be noted that this flattened or compressed perspective effect is produced by the great distance between the camera and the object, not the lens itself. Thus, the perspective does not depend on the objective, but on the distance between the subject and the camera.
    The smaller the viewing angle, the greater the impact of movement or vibration on the camera, which results in spatially variant blurring in the photograph, sometimes the use of a tripod is necessary. As a general rule, when taking pictures without a tripod, a minimum shutter speed equal to the 35mm equivalent focal length used is usually recommended, for example, for an equivalent telephoto lens of 200mm (300mm in APS-C) a minimum speed of 1/200 seconds This inconvenience is accentuated by the lack of brightness of the telephoto lenses, which require a long exposure time when taking photographs, in contrast to the indicated rule.
    The physical limitations mentioned give rise to high volume, weight, fragility and high price optical instruments, as illustrated by the examples of commercial models mentioned above. Therefore, special care must be taken when transporting, which often makes it difficult to transfer to the places where the activity to be portrayed takes place.
    These conditions are far from being ideal in the context in which long-range telephoto lenses are often used, such as in the capture of wildlife images
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    Savage (also called digiscoping), sports competitions, or the kind of photographs of public figures that paparazzi perform.
    The present invention offers a technical solution to many of these problems through the use of a collapsible telephoto lens that can be used with conventional digital cameras. Its design allows to significantly increase the amount of light entering the camera (compared to standard telephoto lenses) despite being very selective in the field of view, which increases the brightness of the whole.
    The internal surface of the low-cost folding telephoto lens acts as an off-center parabolic reflector.
    When the camera is deployed and the camera has been placed near the focal area on its central mast-shaped support, the folding telephoto lens reflects the rays of light that reach it parallel to the axis of the parabola and concentrates them into the camera's aperture ( at least those that affect the portion of the reflector surface visible from the camera position), as seen in Figure 2.
    This operating mechanism is similar to that used in folding parabolic antennas for communications, which were widely used even before the Second World War (as evidenced by US patent US2072262 entitled "Reflecting structure for electric waves", registered by Max Hahnemann Walter and Robert Herzog in 1932). This type of antennas enjoys great popularity in the design of communication systems for satellites due to their small dimensions when they remain folded and the weight reduction that does not require large support structures to maintain the shape of the reflector. Illustrative examples of this technology can be considered US patents US 3064534 (entitled "Reflector for space vehicle", registered by Julius W. Tumavicus in 1960) and US 3541569 (entitled "Expandable parabolic reflector", registered by Roy Acker & Cia. In 1968 ).
    Despite its similarity, the folding telephoto lens has certain peculiarities that clearly distinguish it from this type of antenna.
    On the one hand, the telephoto lens typically operates in the visible range of the electromagnetic spectrum (although its use is also possible in nearby frequency bands, such as infrared or ultraviolet if the camera has a suitable sensor), so the wavelength It is much smaller than that used in communications and coating
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    of the surface that reflects the light rays must not have visible imperfections or roughnesses.
    On the other hand, instead of a feeder or a receiver (typically horn-shaped connected to a transmission line), a camera is placed. This camera, unlike the feeders / receivers, does not point to the center of the paraboloid and does not frame the entire surface of the reflector, but is oriented to one side and only frames a portion of the reflector as if its effective area were smaller and acted As an off-center reflector. In the design of antennas, off-center reflectors are used to prevent the blockage produced by the emitter / receiver element and the structure that supports it causing a modification of the radiation pattern or the effectiveness of the antenna. In the case of folding telephoto lens, the entire section of the paraboloid is maintained to facilitate its deployment and lower the cost of the support structure with a central mast, but it is avoided that said structure occludes elements in the photograph.
    As the reflector acts as if it were off-center, only a part of the parabolic surface is used with the reflective coating (ring-shaped) to capture light, which adds robustness against possible breakage, dust, dirt ... If a portion It is affected by any of these factors, you just have to rotate the camera support and choose an area of the reflector in better conditions. In the case of a communications antenna, this type of design would have a prohibitive cost, since this is very related to the size of the surface and is usually adjusted according to the required gain, while in the folding telephoto the manufacturing materials are more affordable and premium simplicity in the support structure.
    Finally, the design of antennas ensures that the structure that supports the feeder / receiver surrounds the surface of the reflector to serve as a partial support for it and its path is minimal in the area where blockages can occur in the projecting beam , for the reasons mentioned above. Our invention features a mast-shaped support for the camera that starts from the central area of the reflector and serves as a support not only for the camera but also for the structure that allows the reflector to be deployed (although it is also possible for this structure to be located on the other side in the area not visible from the camera when the mast also extends on the other side). In the particular embodiment presented below, the folding telephoto lens has an external shape that vaguely resembles that of an umbrella, although in this case the cover would be parabolic and the cane would coincide with the mast-shaped structure that supports the camera. This possible variant makes the telephoto lens cheaper and allows it to be deployed
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    with a single arm movement. Characteristics that are not usually appreciated in the design of antennas, where durability and adequate conformation of the radiation pattern are prevailed.
    The appearance of the telephoto lens may remind the reflectors that photographers usually use in their studios to illuminate some parts of the scene in a directional way. The devices used are shaped like an umbrella and their inner surface is metallic to reflect the light. However, in these devices, a light source (not a camera) is placed in the focal area and the objective is to direct the light energy towards a relatively close area of the stage, not to capture a distant image. An example of this type of apparatus can be found in US Patent 7452111 entitled "Variable focusing parabolic reflective lighting system", requested by Marco Mazzei in 2005.
    Given the external resemblance of some possible particular embodiments of the folding telephoto lens with a conventional umbrella, it is important to highlight the differences with previous inventions in which umbrellas and parasols are used as supports for cameras.
    Chinese patent CN 2266905, filed in 1995, entitled "comfortable multipurpose umbrella for cameras", proposes an umbrella that performs several functions. On the one hand, the concave surface of the umbrella cover is covered with a very reflective material, which causes the ambient light to refocus forward, lighting the subject under the umbrella. On the other hand, the umbrella has the advantage of protecting the camera when a photographer takes pictures in adverse weather (with rain or snow) when placed under the cover. It is designed to take pictures of the environment from inside the umbrella, once deployed. But in this case, the reflected light is not captured directly by the camera, but it helps to illuminate what is going to be photographed.
    US patent application US 20030201005, filed by Thomas Hilmersen in 2002, entitled "Camera-mounted weather protection umbrella", shares many elements with the previous one and adds a flexible rod in the design that allows the camera to be oriented inside the umbrella, maintaining the protection it offers. Both in the previous patent (CN 2266905), and in this one (US 20030201005), the main purpose is to capture images of the environment surrounding the photographer under the umbrella.
    It is also the case of US patent US 7726326, filed by Daniel J. O'Donnell and Paul A. Crabb in 2008, entitled "Umbrella with repositionable grip". In this
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    In this case, the umbrella has two handles, one of them slider to adapt to the ergonomics of each user. The handle at the end of the umbrella shaft can attach an accessory, such as a camera. The goal, again, is to protect the accessories from the rain, keeping them dry.
    The low-cost folding telephoto lens shares with these patents the idea of placing an image acquisition device on a mast-shaped support around which a curved surface is deployed. However, in our case it is not intended to use the protective screen offered by the umbrella when it is deployed to keep the camera and its lens dry on a rainy day or safe from the intensity of sunlight on a clear day. But it is considered to take advantage of the surface (which in the case of the presented invention has a paraboloid shape) to capture the rays of light parallel to the axis that are reflected in it.
    EXPLANATION OF THE INVENTION
    The low-cost folding telephoto lens is a catopic telephoto lens that is inspired by a Herschel telescope, while a parabolic reflective surface is used to capture a large amount of light in the direction of interest, allowing you to take pictures of objects at large distance.
    The telephoto lens consists of two distinct parts: a folding paraboloid-shaped cover whose interior is covered with a highly reflective material and a mast-shaped support located on the axis of the paraboloid, where the camera is placed. This central support also serves as support for the rest of the elements that help maintain the shape of the paraboloid when deployed.
    The parabolic shape of the surface ensures the angular selectivity of the telephoto lens, which allows amplifying details at a great distance from the position in which the photographer takes the images.
    The aperture size of this telephoto lens is the entire area of the reflective cover that enters the frame of the camera. As indicated above, being an off-center design, the entire exposed area of the paraboloid is not used. Despite this, and taking into account the absorption of energy produced by the reflecting surface, the amount of light collected by this telephoto lens is much greater than that of the larger refractive telephoto lens in the market, with a cost of manufacturing several orders of lower magnitude.
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    By drastically increasing the amount of light entering through the opening of the camera, the impact of unwanted physical effects is reduced. The bokeh is practically eliminated, since it is not necessary to open the camera opening so much to collect light, it is possible to focus on a greater range of distances. Blinding is also mitigated due to vibration when a tripod is not available since, by capturing more light, the shutter speed may be higher.
    This increase in brightness with respect to refractive telephoto lenses translates into much shorter exposure times that make it possible to take videos and also place the camera as a whole with the folding telephoto lens in mobile systems, since the blurring effect is reduced spatially variant to be able to capture the frames quickly. A particularly interesting example is the assembly in unmanned aerial vehicles (drones), which the photographer can control remotely or through a computer program that guides the vehicle through a route to take the images under certain conditions.
    Until now, this type of use was unfeasible for the average user due to the cost, weight and limited brightness of the telephoto lenses, since the vibration due to the movement of the propellers of the multicopters blur the image (in addition to hindering the pointing). The risk of damaging such an expensive optical device due to an accidental landing or fall reduced its application to military purposes or large corporations.
    The telephoto lens will be much brighter the higher the reflection coefficient of the material used as a mirror on the roof, as well as its uniformity in the frequency range captured by the sensor and the surface area framed by the camera.
    The cover can be made in many ways.
    For example, it can be composed of a set of elongated rigid sheets in the shape of the corresponding paraboloid portion that, as petals, can be deployed, as shown in US patent US 3064534 cited above as an example of antenna in the microwave band
    Another possible alternative, lighter and resistant against possible blows, would be a flexible cover whose parabolic shape is maintained with a support and deployment mechanism that can be reminiscent of that of an umbrella. So that the pattern with which the portions of the flexible material are cut and joined (for example a fabric with a fabric that makes it slightly extensible) together with the force exerted by the rods and the
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    lower arms thereof, make the cover present an interior surface with a shape similar to that of a paraboloid.
    The rods are in solidarity with the cover. Their placement (equidistant), the material with which they are manufactured and the design of their profile have to be chosen carefully since it depends on them that the cover has the expected shape when deployed.
    Since a good part of the materials are flexible and deform each time the roof is deployed, its shape can be expected to change slightly over time. To improve the robustness against manufacturing tolerances and the effect of possible wear due to use, the rods have a set of fiduciary marks that facilitate the calibration process and allow, by analyzing the captured images, to know the possible deviations and compensate for the optical aberrations produced by them, through the subsequent processing of the images.
    On the other hand, the central support, in the form of a mast, joins the cover at one of its ends and maintains the shape of the paraboloid by means of the tension exerted through the lower arms where they rest on the rods.
    The central support coincides with the axis of the paraboloid that forms the cover and has an adapter that makes it possible to rotate both the handle, by which the telephoto lens is held, as well as the support of the camera itself at the height of the focal area. The handle is between the camera support and the reflecting surface, so that the camera acts as a counterweight and facilitates the handling and pointing of the assembly. In addition, it is oriented on the opposite side where the camera is pointing to avoid blocking its field of vision.
    The camera support has a screw in which it is screwed to be firmly attached. The screw can remain hidden when the telephoto lens is not used, by means of a cover, which can incorporate a magnetic, screwed or any other type of closure. So that the projection of the screw does not cause any damage, nor its function deteriorates, if the telephoto lens falls accidentally when the cover is on.
    Due to the catóptrica nature of the telephoto lens, the camera looks inside the paraboloid and it is this that must be directed towards the scene to be photographed. The off-center design favors that the photographer can hold the camera and telephoto set as a whole, and orient them towards the area of interest without their reflection showing the photograph.
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    On the other hand, the fiduciary marks that are included hide part of the image that is reflected on the inner surface of the roof. Since once the image is taken, the digital system detects its position with great precision to measure the deformation in the rods with respect to the expected parabolic shape, as well as the position and orientation of the chamber with respect to them, it is simple that the area that occupy be marked and labeled for subsequent replacement. The presence of fiduciary marks can be eliminated from photographs or video sequences using digital image processing techniques (such as techniques protected by US patents US 6987520, US 7551181, US 7755645 and US 7840086, or more sophisticated ones that take advantage of the temporal coherence in the video sequences).
    Many other embodiments are possible. For example, the cover could be composed of rigid plates that when deployed give rise to the required paraboloid shape, as already indicated in the description. Also the support structure, with rods and lower arms, can be placed in the outer area so that its visual impact is not as pronounced, but the resulting design is more complex and prone to breakage.
    Other features and advantages of the present invention will be apparent from the detailed description of a particular embodiment of the invention that follows in reference to the accompanying drawings.
    BRIEF DESCRIPTION OF THE DRAWINGS
    To complement the description that is being made and in order to help a better understanding of the characteristics of the invention, a set of drawings is attached as an integral part of said description, where illustrative and non-limiting nature has been represented. next:
    Figure 1.- Shows a perspective view with a side section of the particular embodiment of the low cost folding telephoto lens detailed in the following section. The camera (6) is placed on a ball joint (7) that is attached to the adapter (5). The set has a shape reminiscent of a conventional umbrella, although its functionality is profoundly different.
    Figure 2.- It shows a scheme as a sagittal section of the particular embodiment of the low cost folding telephoto lens. It is observed how the rays of light (11) parallel to the axis (2) of the paraboloid are reflected on the surface of the reflector (1,9) and are concentrated
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    near the camera opening (6). In general, the camera is placed near the focal point but not directly on it, due to the slight inaccuracies that are made when placing the elements by hand.
    Figure 3.- Shows a perspective view of the deployed telephoto lens in which the support structure of the roof (1,9) with rods (3) and lower arms (4), as well as fiduciary marks (10) and the chamber (6) in the adapter (5) on the mast-shaped support (2).
    Below is a list of the different elements represented in the figures that make up the invention:
    1. Paraboloid-shaped surface or cover.
    2. Mast-shaped central support.
    3. Rod
    4. Lower arms.
    5. Adapter for angular placement of the camera support and the handle.
    6. Camera.
    7. Ball joint.
    8. Contera.
    9. Area covered with high reflectivity material.
    10. Fiduciary brand.
    11. Rays parallel to the axis of the paraboloid that delimit the visible area from the point of view of the camera.
    PREFERRED EMBODIMENT OF THE INVENTION
    Figure 3 shows a particular embodiment of a low-cost folding telephoto lens positioned in the way it would be used to acquire images at a great distance.
    The objective consists of two distinct parts: the surface that acts as a parabolic reflector (1) and the structure that maintains its shape and supports the chamber (6) in which the light rays (11) are concentrated. In this example, the cover (1) is made of a fabric whose fiber network makes the material practically inextensible for the range of forces expected by the support structure when it is deployed. Said cover (1) is formed by sections that have been cut so that the extended assembly has the shape of a paraboloid and the seams are just in the positions occupied by the rods (3) that hold the fabric. The side of the fabric that is
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    facing the interior of the paraboloid is metallized (9) with a very thin layer (of a thickness less than a tenth of a millimeter) and a smooth non-oxidizable alloy with a perfectly uniform color (preferably with a reflection coefficient greater than 80% for all wavelengths in the range of visible light), such that rays parallel to the axis of the paraboloid are reflected towards the focal area when the telephoto lens is deployed. The thin thickness of the metallization hardly reduces the flexibility of the fabric. Supplementary layers of polymeric material are incorporated between the fabric (1) and the metallization layer (9) that help to uniformize and eliminate the possible roughness due to the texture formed by the intersecting fibers to compose the fabric.
    The central support (2) joins at one of its ends to the reflecting surface (1), where all the rods (3) are also attached thereto, and is collinear to the axis of the paraboloid. A mechanism, well known in the manufacture of umbrellas, regulates the height from which the lower arms (4) of the central support (2), which at its other end join the rods (3). The lower arms (4) have a joint that allows them to bend to fold the surface of the paraboloid. When the mechanism that regulates the height is located near the union of the central support with the rods, the lower arms extend and tighten the rods, giving rise to the expected shape.
    The external structure vaguely resembles that of an umbrella, for this reason, this example of preferred embodiment has the additional advantage of being able to impersonate an umbrella in those places where photographers who carry traditional telephoto lenses are discriminated. As they can be zones in warlike conflict, where their activity can be considered as espionage, or events in which they can only remain in certain designated areas. This feature is especially useful in hostile environments where professional photographers are discriminated against. Since the criterion to distinguish a professional photographer from an amateur, in the absence of accreditations, can be as simple as the use of traditional large telephoto lenses.
    The structure of the central support (in the form of a mast), the rods in solidarity with the fabric and the rays that join them, are reinforced on the outside (the non-metallic side of the roof) by cloth tapes or rings of other materials that maintain the desired curvature in the rods so that the focal point of the paraboloid is maintained in the intended position.
    The central support (2) has an adapter (5) that makes it possible to rotate both the handle, by which the telephoto lens is held, as well as the support of the camera itself (6) at the height of the focal area. The exact position must be adjusted for each model of
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    camera (6), so that the image captured on the surface of the reflector (1) does not have severe optical aberrations due to the incorrect placement of the camera (6).
    In figure 2 the size of the adapter (5) and the support that moves in solidarity with it have been exaggerated, to make it more visible, which slightly detracts from the position of the camera (6) in the representation of said figure. The optical axis of the chamber opening (6) would be positioned so that the main ray (in English, chief ray) passes through it and also through the focal point of the paraboloid.
    Along the rods there is a set of fiduciary marks (10) that can be glued on the surface of the reflector (9). After the analysis of the captured images, the fiduciary marks (10) allow to determine the relative position and orientation of the camera, as well as the possible deviation in the curvature of the surface, which can later be compensated by spatially variant image restoration strategies .
    On the end of the camera holder there is a screw. This screw is firmly anchored, and corresponds to a thread of diameter of 0.25 inches, 20 threads per inch and a unified American thick passage, as described in DIN4503 (199310) and ISO 1222: 1987 (revised in 2003) . This type of screw is typically used on commercial tripods to fit the cameras to the shoe.
    In addition, with an additional element that increases the thickness of the assembly to 3/8 inch, standard ball joints (7) can be attached, as shown in the drawings.
    Optionally a cover can be incorporated, which in this particular embodiment is screwed in the same way in which a chamber (6) would fit. When the cover is not present, a simple ball joint (7) can be adjusted on the screw, using the mentioned element. The kneecap (7) increases the degrees of freedom to position the camera (6), so that the desired inclination in the frame is chosen when focusing the telephoto lens surface. Other devices can also be used, such as mobile phone adapters, very popular in selfie scooters.
    Finally, it should be noted that the bead (8) can be of material other than that of the central support, which provides greater durability to wear. Likewise, the central support can have a telescopic design that allows to reduce its dimensions to facilitate its transport and storage when the telephoto lens is not used.
    Once the nature of the present invention has been sufficiently described, as well as a preferred embodiment, it only remains to be added that said invention may undergo certain variations in form and materials, as long as said alterations do not substantially vary the characteristics claimed below.
    权利要求:
    Claims (6)
    [1]
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    1. Low cost folding telephoto lens comprising:
    - a folding cover (1);
    - an elongated and straight central support (2);
    - a support for fixing an image acquisition system, such as a standard digital camera (6);
    characterized in that the surface of the folding cover is shaped like a paraboloid when it is extended and is covered on the inside of a smooth material with a coefficient of reflectivity greater than 80% in the frequency band of the visible spectrum (9), the central support (2) is jointly and severally connected to the cover (1) at its central point, it is aligned with the axis of the paraboloid and has a length less than the focal length of the paraboloid, the camera holder being located at the opposite end of the central support, The assembly has dimensions such that the ray of light parallel to the axis of the paraboloid that passes through the center of the area framed by image acquisition system (6) also passes through the center of the opening of the image acquisition system and through the focal point of the paraboloid.
    [2]
    2. Low-cost folding telephoto lens according to the preceding claim, characterized in that the parabolic shape of the cover is maintained thanks to a system of radial rods (3), which are supported on the central support by lower arms (4).
    [3]
    3. Low cost folding telephoto lens according to the preceding claim, characterized in that a set of fiduciary marks (10) is located on the radial rods (3).
    [4]
    4. Low cost folding telephoto lens according to the preceding claim, characterized in that the cover (1) is made of inextensible fabric and the seams that join the portions that form the paraboloid are concealed behind the area occupied by the rods (3).
    [5]
    5. Low-cost folding telephoto lens, according to the preceding claim, characterized in that it has an adapter (5) with handle that allows both this and the camera support to be rotated and at the end of said support a screw that allows screwing is placed directly, or through an adjustable ball joint (7), an image acquisition device (6).
    [6]
    6. Low cost folding telephoto lens, according to any of the preceding claims, characterized in that the screw is covered by a cover, which can optionally be fixed to the rest of the support by means of a magnetic, screw-in, or any other type of closure.
    5. Low-cost folding telephoto lens according to the preceding claim, characterized
    because cover is reinforced on the outer part not metallized by bands of fabric or rings of other materials, which maintain the curvature of the rods.
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    同族专利:
    公开号 | 公开日
    ES2684492B1|2019-08-13|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US5760826A|1996-05-10|1998-06-02|The Trustees Of Columbia University|Omnidirectional imaging apparatus|
    US6491405B1|1999-11-20|2002-12-10|John E. Shirilla|Photographic umbrella with reflective and diffusive linings|
    US20130208083A1|2012-02-15|2013-08-15|City University Of Hong Kong|Panoramic stereo catadioptric imaging|
    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201730502A|ES2684492B1|2017-03-30|2017-03-30|LOW COST FOLDABLE TELEOBJECTIVE|ES201730502A| ES2684492B1|2017-03-30|2017-03-30|LOW COST FOLDABLE TELEOBJECTIVE|
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