Ultrathin VND CPL filter

Abstract

The utility model relates to an ultrathin VNDamp. The CPL filter comprises a bottom ring, a lower ring and an upper ring, the bottom ring is used for being connected with a camera lens, the bottom ring is buckled and rotationally connected to the bottom of the lower ring, the upper ring is buckled and rotationally connected to the top of the lower ring, a magnetic induction iron sheet is fixed to the bottom ring, a first magnet is fixed to the lower ring, a second magnet is fixed to the upper ring, and the magnetic induction iron sheet and the first magnet attract each other to provide rotation resistance for the bottom ring and the lower ring. The first magnet and the second magnet are magnetically attracted to provide rotation resistance of the lower ring and the upper ring, the first CPL lens is fixed in the lower ring, the second CPL lens is fixed in the upper ring, the first CPL lens and the second CPL lens are independently rotated and adjusted along with the lower ring and the upper ring, a magnetic attraction rotation adjustment structure is adopted, the influence of external factors on rotation adjustment is effectively avoided, and the adjustment precision is improved. And a light and thin structural design is adopted, the vignetting effect is reduced, the device can be compatible with most of stabilizers in the market, other special effect filters can be magnetically attracted through the second magnet, and the combined shooting function is added.

Description

Technical Field

[0001] This utility model relates to the field of camera filter technology, and in particular to ultra-thin VND & CPL filters. Background Technology

[0002] In the fields of photography and videography, CPL (polarizing filter) and VND (variable ND filter) are common optical filters, and photographers often need to use both simultaneously to control light reflection and exposure. However, current VND & CPL combination filters on the market have many limitations in their structural design, affecting the user experience and product performance.

[0003] Currently, filters that achieve VND & CPL combined functionality typically use thicker optical glass to accommodate the dual filter function. This design increases the overall size and thickness of the product, affecting not only aesthetics but also lens compatibility and limiting the filter's versatility.

[0004] Furthermore, to ensure that the VND and CPL functions do not interfere with each other during adjustment, existing technologies typically use damping oils of different consistencies to control the rotational damping of the filter, thus preventing users from accidentally activating the CPL while adjusting the VND, or from affecting the VND while adjusting the CPL. However, this technical solution has many drawbacks in practical applications.

[0005] Specifically, under normal circumstances: the VND function uses damping oil with a higher damping value to ensure greater stability when adjusting the ND density. The CPL function uses damping oil with a lower damping value so that users can easily adjust the polarization angle. This structural design has the following drawbacks:

[0006] 1. Highly Affected by Temperature Changes – The viscosity of damping oil is significantly affected by ambient temperature. The damping value will change in different regions, seasons, and even weather conditions, resulting in inconsistent filter rotation feel and affecting the user experience. For example, in cold environments, damping oil may thicken, making rotation difficult, while in high-temperature environments, damping oil may thin, leading to a decrease in damping force, causing the CPL or VND to rotate too quickly or even out of control.

[0007] 2. Poor consistency due to manual application of damping oil – Since the application of damping oil during the production process relies on manual operation, the amount and evenness of the oil applied by different workers may vary, resulting in different rotational feel for each filter, affecting product consistency and user experience.

[0008] 3. Damping oil aging problem – After prolonged use, the damping oil may become ineffective due to oxidation, evaporation, or loss, resulting in a decrease in damping effect and affecting the adjustment accuracy and stability of the filter.

[0009] 4. Increased production costs – Because the application of damping oil requires strict application processes and quality control, this approach increases production difficulty and costs.

[0010] 5. Excessive Thickness and Weight – Because the VND & CPL combined filter needs to accommodate multiple layers of optical glass, its overall thickness is relatively large, which can easily cause vignetting, especially when used at wide-angle ends, affecting image quality. The excessive thickness and size also increase the filter's weight, which may exceed the load capacity of many camera stabilizers (gimbals), causing the device to malfunction and greatly reducing portability and ease of use.

[0011] 6. Interference when adjusting CPL and VND – Existing VND & CPL combination filters have structural limitations during adjustment, preventing the two functions from being controlled independently: adjusting the VND level first and then the CPL may change the VND level; adjusting the CPL angle first and then the VND level will also affect the CPL angle. This interference is a common problem with all VND & CPL combination filters currently on the market, and there is still no ideal solution. This forces photographers to make repeated adjustments, which is time-consuming and laborious, impacting shooting efficiency.

[0012] etc. Utility Model Content

[0013] Based on this, in order to overcome the shortcomings of the existing technology, this utility model provides an ultra-thin VND & CPL filter, which abandons the damping oil control scheme and uses magnetic force control to more accurately control the damping of CPL and VND. The connection structure is optimized and the VND & CPL can be made thinner and lighter through lightweight materials, which greatly reduces the generation of vignetting and is compatible with the weight specified by most stabilizers on the market.

[0014] The technical solution adopted by this utility model to solve its technical problem is: to provide an ultra-thin VND & A CPL filter includes a base ring for fixedly attaching to a camera lens. A magnet is fixedly attached to the top of the base ring. A first annular groove is formed on the upper inner wall of the base ring. A lower ring is located above the base ring, and a first annular buckle is located at the bottom of the lower ring. The first annular buckle engages with the first annular groove and rotates. To prevent the lower ring from detaching from the base ring during use, the first annular buckle can be designed as an inverted buckle. A first magnet groove is formed at the bottom of the lower ring above the magnet, and a first magnet is fixedly attached to the first magnet groove. The first magnets are evenly spaced in a ring within the first magnet groove, and the attractive force between the first magnet and the magnet can be adjusted by controlling the number of first magnets. A first filter groove is formed on the upper inner wall of the lower ring, and a first CPL lens is fixedly attached to the first filter groove. A second annular groove is formed on the upper inner wall of the lower ring outside the first filter groove. An upper ring is located above the lower ring, and a second annular buckle is located on the bottom outer wall of the upper ring. The second annular buckle engages with the second annular groove. Similarly, to prevent the upper and lower rings from separating during use, the second annular buckle can be designed as an inverted buckle structure. A second magnet groove is opened at the upper end of the upper ring, and a second magnet is fixed in the second magnet groove. The second magnets are evenly spaced in the second magnet groove, and the attraction between the second magnet and the first magnet can be adjusted by controlling the number of second magnets. The upper and lower positions of the attracting magnet, the first magnet, and the second magnet are corresponding to ensure the stability of the magnetic connection. A second filter groove is opened at the upper end of the second magnet groove, and a second CPL lens is fixedly connected in the second filter groove. Stable rotational resistance is generated by the magnetic attraction between the attracting magnet and the first magnet. Rotating the lower ring can realize the synchronous and precise angle rotation adjustment of the first CPL lens and the second CPL lens. Stable rotational resistance is generated by the magnetic attraction between the second magnet and the first magnet. The lower ring can be manually fixed, and the angle between the second CPL lens and the first CPL lens can be precisely adjusted by rotating the upper ring.

[0015] A VND filter is composed of two stacked CPL filters. In this design, it consists of a first CPL lens and a second CPL lens, one of which is fixed while the other is rotatable. Rotating the adjustable filter changes the relative polarization angle between the two CPL lenses. In this design, the first CPL lens can be manually fixed while the second CPL lens is rotated, thus affecting the amount of light passing through the filter. The larger the rotation angle, the less light passes through, thereby reducing exposure and achieving the effect of an ND filter. The rotating structure design allows for flexible adjustment of the amount of light passing through, offering greater flexibility than traditional fixed ND filters.

[0016] A CPL filter can reduce reflected light or increase color saturation by rotating it, controlling the amount of light passing through by polarizing light. When a polarizing filter rotates, it creates varying degrees of polarization, thus altering the amount of light passing through the filter. Once the angle of the VND filter is adjusted, while keeping the VND angle constant, adjusting the angle of the VND filter can reduce reflected light or increase color saturation, thus also functioning as a CPL filter. In this solution, after fixing the angles of the first and second CPL lenses, rotating the lower ring causes the first and second CPL lenses to rotate synchronously, achieving the CPL filter adjustment function.

[0017] In this design, the lower ring serves as the central transition connector. The lower ring connects to the bottom ring via a snap-fit ​​and rotation mechanism, while the upper ring connects to the top ring via a snap-fit ​​and rotation mechanism. This minimizes the number of transition connectors between components, effectively reducing the overall thickness of the ultra-thin VND & CPL filters. In the specific structural design, the first annular slot, iron plate slot, and first arc-shaped limiting component on the bottom ring are essentially horizontally positioned on the same horizontal plane, meaning there is no vertical stacking, minimizing the vertical space occupied by the bottom ring and effectively controlling its thickness. Similarly, the first magnet slot, second annular slot, first filter slot, and second arc-shaped limiting component on the lower ring are also horizontally positioned on the same horizontal plane, again minimizing vertical stacking and effectively controlling the thickness of the lower ring. The upper ring's structural design follows the same principle, avoiding vertical stacking as much as possible and employing a horizontally laid-out design to ensure the ultra-thin VND & CPL filters are properly aligned. The ultra-thin design of the CPL filter effectively reduces the vignetting effect that may occur during use. In addition, the bottom, upper, and lower rings can be made of lightweight materials such as aluminum alloy and plastic, further reducing the weight of the ultra-thin VND & CPL filter. This reduces the burden on the camera and makes it compatible with the weight specifications of most stabilizers on the market.

[0018] Preferably, the bottom outer wall of the bottom ring is provided with external threads, which are used to connect and fix it to the camera lens thread.

[0019] Preferably, the upper end of the bottom ring has an iron plate groove, and the magnet is fixedly connected in the iron plate groove.

[0020] Preferably, the outer wall of the bottom ring is symmetrically provided with two outwardly extending first arc-shaped limiting members, and the included angle between the adjacent ends of the two first arc-shaped limiting members and the axis is 110°. The inner wall of the bottom of the lower ring is symmetrically provided with two inwardly extending limiting protrusions, which are placed between the two first arc-shaped limiting members and cooperate with the first arc-shaped limiting members for limiting. That is, by rotating the lower ring, the first CPL lens and the second CPL lens can be synchronously rotated and adjusted along the central axis within the range of 0°-110°.

[0021] Preferably, the upper end of the lower ring is symmetrically provided with two upwardly extending second arc-shaped limiting members, and the outer wall of the upper ring is symmetrically provided with two outwardly extending third arc-shaped limiting members. The third arc-shaped limiting members are located between the two second arc-shaped limiting members and are limited and cooperate with the second arc-shaped limiting members. The third arc-shaped limiting members can rotate within the range of 0°-71° relative to the axis between the two second arc-shaped limiting members. That is, the second CPL lens can be rotated and adjusted relative to the lower ring within the range of 0°-71° by rotating the upper ring. In this design, the angle range of 0°-71° can be set as multiple adjustment levels and marked for user convenience.

[0022] Preferably, the ultra-thin VND & CPL filter has a magnetic connection to a special effects filter at the top. Other special effects filters can be magnetically attached via a second magnet to enrich the shooting effects. The magnetic connection also facilitates the quick replacement of special effects filters, making it convenient to use.

[0023] Preferably, the ultra-thin VND & CPL filter has a filter cover that is fastened to the top, which can protect the filter when it is not in use.

[0024] The beneficial effects of this utility model are:

[0025] The aforementioned ultra-thin VND & CPL filters abandon the traditional rotating control structure of damping oil and adopt a magnetic structure to provide rotational resistance, enabling independent rotational adjustment of the VND and CPL. This effectively avoids the influence of external factors on adjustment accuracy and allows for magnetic connection with other special effects filters for combined use, providing more combined shooting functions. The lightweight and thin design not only effectively reduces the size and weight of the filters but also effectively reduces the vignetting effect that may occur during use. Through the rational layout of filter components and optimization of internal structure, the entire system is lighter and less burdened on the camera, thereby improving the user's ease of operation and shooting efficiency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model from a top view.

[0027] Figure 2 This is a schematic diagram of the overall structure of the present invention from the bottom view.

[0028] Figure 3 This is an exploded view of the present invention;

[0029] Figure 4 This is a cross-sectional structural diagram of the present invention;

[0030] Figure 5 This is a schematic diagram of the upper ring structure in this utility model;

[0031] Figure 6 This is a structural schematic diagram of the lower ring from the top view of this utility model;

[0032] Figure 7 This is a structural schematic diagram of the lower ring from the bottom view of this utility model;

[0033] Figure 8 This is a schematic diagram of the bottom ring structure of this utility model;

[0034] Figure 9 This is a reference diagram showing the usage state of this utility model in conjunction with a special effects filter using magnetic attachment;

[0035] Figure 10 This is a reference diagram showing the usage state of this utility model in conjunction with the lens cap.

[0036] in:

[0037] 1. Bottom ring; 11. First annular groove; 12. Iron plate groove; 13. First arc-shaped limiting component;

[0038] 2. Magnetizing sheet;

[0039] 3. The first magnet;

[0040] 4. Lower ring; 41. First annular buckle; 42. First magnet groove; 43. Second annular groove; 44. First filter groove; 45. Limiting protrusion; 46. Second arc-shaped limiting component;

[0041] 5. First CPL lens;

[0042] 6. Upper ring; 61. Second annular buckle; 62. Second magnet groove; 63. Second filter groove; 64. Third arc-shaped limiting component;

[0043] 7. The second magnet;

[0044] 8. Second CPL lens;

[0045] 9. Functional filters;

[0046] 10. Filter cap. Detailed Implementation

[0047] To deepen the understanding of this utility model, the following detailed description will be provided in conjunction with embodiments. These embodiments are only used to explain this utility model and do not constitute a limitation on the scope of protection of this utility model.

[0048] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0050] like Figures 1 to 10As shown, this utility model provides an ultra-thin VND & CPL filter, including a bottom ring 1 for fixed connection to a camera lens. A magnet 2 is fixedly connected to the top of the bottom ring 1. A first annular groove 11 is formed on the inner wall of the upper end of the bottom ring 1. A lower ring 4 is provided above the bottom ring 1. A first annular buckle 41 is provided at the bottom of the lower ring 4. The first annular buckle 41 is engaged with the first annular groove 11 and rotates to cooperate. In order to prevent the lower ring 4 from detaching from the bottom ring 1 during use, the first annular buckle 41 can be designed as an inverted buckle structure. A first magnet groove 42 is formed at the bottom of the lower ring 4 above the magnet 2. The first magnet groove 42 is fixed inside the magnet 2. A first magnet 3 is fixedly connected to the first magnet groove 42. The first magnets 3 are arranged in a ring at equal intervals in the first magnet groove 42. The attraction between the first magnet 3 and the magnet sheet 2 can be adjusted by controlling the number of first magnets 3. A first filter groove 44 is opened on the inner wall of the upper end of the lower ring 4. A first CPL lens 5 is fixedly connected in the first filter groove 44. A second annular groove 43 is provided on the inner wall of the upper end of the lower ring 4 outside the first filter groove 44. An upper ring 6 is provided above the lower ring 4. A second annular buckle 61 is provided on the outer wall of the bottom of the upper ring 6. The second annular buckle 61 and the second annular groove are connected. 43. The fasteners engage and rotate. Similarly, to prevent the upper ring 6 from separating from the lower ring 4 during use, the second annular buckle 61 can be configured as an inverted buckle structure. A second magnet groove 62 is opened at the upper end of the upper ring 6, and a second magnet 7 is fixed inside the second magnet groove 62. The second magnets 7 are evenly spaced in a ring within the second magnet groove 62, and the attractive force between the second magnet 7 and the first magnet 3 can be adjusted by controlling the number of second magnets 7. The upper and lower positions of the magnetic piece 2, the first magnet 3, and the second magnet 7 correspond to each other to ensure the stability of the magnetic connection. A second filter groove 63 is provided at the upper end of the groove 62. A second CPL lens 8 is fixedly connected in the second filter groove 63. Stable rotational resistance is generated by the magnetic attraction between the magnet 2 and the first magnet 3. Rotating the lower ring 4 can realize the synchronous and precise angle rotation adjustment of the first CPL lens 5 and the second CPL lens 8. Stable rotational resistance is generated by the magnetic attraction between the second magnet 7 and the first magnet 3. The lower ring 4 can be manually fixed. By rotating the upper ring 6, the angle between the second CPL lens 8 and the first CPL lens 5 can be precisely adjusted.

[0051] A VND filter is composed of two stacked CPL filters. In this design, it consists of a first CPL lens 5 and a second CPL lens 8, one of which is fixed while the other is rotatable. Rotating the adjustable filter changes the relative polarization angle between the two CPL lenses. In this design, the first CPL lens 5 can be manually fixed while the second CPL lens 8 is rotated, thus affecting the amount of light passing through the filter. The larger the rotation angle, the less light passes through, thereby reducing exposure and achieving the effect of an ND filter. The rotating structure design allows for flexible adjustment of the amount of light passing through, offering greater flexibility than traditional fixed ND filters.

[0052] A CPL filter can reduce reflected light or increase color saturation by rotating it, controlling the amount of light passing through by polarizing light. When a polarizing filter rotates, it creates varying degrees of polarization, thus altering the amount of light passing through the filter. Once the angle of the VND filter is adjusted, while keeping the VND angle constant, adjusting the angle of the VND filter can reduce reflected light or increase color saturation, thus simultaneously functioning as a CPL filter. In this solution, after the angles of the first CPL lens 5 and the second CPL lens 8 are fixed, rotating the lower ring 4 causes the first CPL lens 5 and the second CPL lens 8 to rotate synchronously, achieving the CPL filter adjustment function.

[0053] In this design, the lower ring 4 serves as a central transition connector. The lower ring 4 is connected to the bottom ring 1 via a snap-fit ​​and rotation mechanism, while the upper ring 4 is connected to the upper ring 6 via a snap-fit ​​and rotation mechanism. This minimizes the number of transition connectors between components, effectively reducing the overall thickness of the ultra-thin VND & CPL filters. In the specific structural design, the first annular slot 11, the iron plate slot 12, and the first arc-shaped limiting member 13 on the bottom ring 1 are essentially horizontally positioned on the same horizontal plane, meaning there is no vertical stacking, minimizing the vertical space occupied by the bottom ring 1 and effectively controlling its thickness. Similarly, the first magnet slot 42, the second annular slot 43, the first filter slot 44, and the second arc-shaped limiting member 46 on the lower ring 4 are also horizontally positioned on the same horizontal plane, again minimizing vertical stacking and effectively controlling the thickness of the lower ring 4. The upper ring 6 is designed similarly, avoiding vertical stacking as much as possible and employing a horizontally laid-out design to ensure the ultra-thin VND & CPL filters are properly aligned. The ultra-thin design of the CPL filter effectively reduces the vignetting effect that may occur during use. In addition, the bottom ring 1, lower ring 4, and upper ring 6 can be made of lightweight materials such as aluminum alloy and plastic, further reducing the weight of the ultra-thin VND & CPL filter. This reduces the burden on the camera and makes it compatible with the weight specifications of most stabilizers on the market.

[0054] Furthermore, the bottom outer wall of the bottom ring 1 is provided with external threads, which are used to connect and fix it to the camera lens thread.

[0055] Furthermore, an iron plate groove 12 is provided at the upper end of the bottom ring 1, and the magnet plate 2 is fixedly connected in the iron plate groove 12.

[0056] Furthermore, the outer wall of the bottom ring 1 is symmetrically provided with two outwardly extending first arc-shaped limiting members 13. The angle between the adjacent ends of the two first arc-shaped limiting members 13 and the axis is 110°. The inner wall of the bottom of the lower ring 4 is symmetrically provided with two inwardly extending limiting protrusions 45. The limiting protrusions 45 are placed between the two first arc-shaped limiting members 13 and are limited and cooperated with the first arc-shaped limiting members 13. That is, by rotating the lower ring 4, the first CPL lens 5 and the second CPL lens 8 can be synchronously rotated and adjusted along the central axis within the range of 0°-110°.

[0057] Furthermore, the upper end of the lower ring 4 is symmetrically provided with two upwardly extending second arc-shaped limiting members 46, and the outer wall of the upper ring 6 is symmetrically provided with two outwardly extending third arc-shaped limiting members 64. The third arc-shaped limiting members 64 are located between the two second arc-shaped limiting members 46 and are limited and cooperate with the second arc-shaped limiting members 46. The third arc-shaped limiting members 64 can rotate within the range of 0°-71° relative to the axis between the two second arc-shaped limiting members 46. That is, by rotating the upper ring 6, the second CPL lens 8 can be rotated and adjusted relative to the lower ring 4 within the range of 0°-71°. In this design, the angle range of 0°-71° can be set as multiple adjustment levels and marked for user convenience.

[0058] Furthermore, the ultra-thin VND & CPL filter is magnetically connected to an effect filter 9 at the top. Other effect filters 9 can be magnetically attached via a second magnet 6 to enrich the shooting effects. The magnetic connection also facilitates quick replacement of effect filters, making it convenient to use.

[0059] Furthermore, the ultra-thin VND & CPL filter has a filter cover 10 fastened to its upper end, which can protect the filter when it is not in use.

[0060] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An ultra-thin VND & CPL filter, characterized in that, The device includes a base ring (1) for fixed connection to a camera lens. A magnet (2) is fixedly connected to the top of the base ring (1). A first annular groove (11) is provided on the inner wall of the upper end of the base ring (1). A lower ring (4) is provided above the base ring (1). A first annular buckle (41) is provided at the bottom of the lower ring (4). The first annular buckle (41) is engaged with the first annular groove (11) and rotates to engage. A first magnet groove (42) is provided at the bottom of the lower ring (4) above the magnet (2). A first magnet (3) is fixedly connected in the first magnet groove (42). A first filter groove (44) is provided on the inner wall of the upper end of the lower ring (4). A first CPL filter is fixedly connected in the first filter groove (44). The lower ring (4) has a second annular groove (43) on the inner wall of the upper end located outside the first filter groove (44). The upper ring (6) is located above the lower ring (4). The lower ring (6) has a second annular buckle (61) on the outer wall of the bottom of the upper ring (6). The second annular buckle (61) is fastened to the second annular groove (43) and rotates. The upper end of the upper ring (6) has a second magnet groove (62). The second magnet (7) is fixed in the second magnet groove (62). The magnet sheet (2), the first magnet (3), and the second magnet (7) are positioned vertically. The upper end of the second magnet groove (62) has a second filter groove (63). The second CPL lens (8) is fixedly connected in the second filter groove (63).

2. The ultra-thin VND & CPL filter according to claim 1, characterized in that, The bottom ring (1) has an external thread on its outer wall, which is connected and fixed to the camera lens thread through the external thread.

3. The ultra-thin VND & CPL filter according to claim 1, characterized in that, The bottom ring (1) has an iron plate groove (12) at the upper end, and the magnet plate (2) is fixedly connected in the iron plate groove (12).

4. The ultra-thin VND & CPL filter according to claim 1, characterized in that, The outer wall of the bottom ring (1) is symmetrically provided with two outwardly extending first arc-shaped limiting members (13). The angle between the adjacent ends of the two first arc-shaped limiting members (13) and the axis is 110°. The inner wall of the bottom of the lower ring (4) is symmetrically provided with two inwardly extending limiting protrusions (45). The limiting protrusions (45) are placed between the two first arc-shaped limiting members (13) and are limited and cooperated with the first arc-shaped limiting members (13).

5. The ultra-thin VND & CPL filter according to claim 1, characterized in that, The upper end of the lower ring (4) is symmetrically provided with two upwardly extending second arc-shaped limiting members (46), and the outer wall of the upper ring (6) is symmetrically provided with two outwardly extending third arc-shaped limiting members (64). The third arc-shaped limiting member (64) is located between the two second arc-shaped limiting members (46) and is limited and cooperated with the second arc-shaped limiting members (46). The third arc-shaped limiting member (64) can rotate within the range of 0°-71° relative to the axis between the two second arc-shaped limiting members (46).

6. The ultrathin VND & CPL filter according to any one of claims 1 to 5, characterized in that, The ultra-thin VND & CPL filter has a magnetic connection to a special effects filter (9) at the top.

7. The ultrathin VND & CPL filter according to any one of claims 1 to 5, characterized in that, The ultra-thin VND & CPL filter has a filter cap (10) fastened to the top.

Images