Filter is an optical device used to select the required radiation band. A common feature of filters is that no filter can make the imaging of celestial bodies brighter, because all filters will absorb certain wavelengths, making objects darker. Color filter These are flat glass or gelatin sheets of various colors with a transmission bandwidth of hundreds of Angstroms. They are mostly used in broadband photometry or installed in stellar spectrograph to isolate overlapping spectral levels. Its main feature is that the size can be made quite large. Thin film filter Generally, the transmission wavelength is long and is mostly used as infrared filter. The latter is on a certain film base. Principle The filter is made of plastic or glass with special dyes. The red filter can only let the red light pass through, and so on. The transmittance of glass sheet is similar to that of air, and all colored light can pass through, so it is transparent. However, after dyeing with dye, the molecular structure changes, the refractive index also changes, and the passage of some colored light changes. For example, when a white light passes through a blue filter, it emits a blue light, while there are very few green and red light, and most of them are absorbed by the filter. Effect The filter plays a great role. Widely used in photography. Why is the main scene always so prominent in the landscape paintings taken by some photographers and how to do it? This uses filters. For example, if you want to take a yellow flower with a camera, the background is blue sky and green leaves. If you take it as usual, you can't highlight the theme of "yellow flower", because the image of yellow flower is not prominent enough. However, if a yellow filter is placed in front of the lens to block the green light scattered by some green leaves and the blue light scattered by the blue sky, an

Cylindrical lens is an aspherical lens, which can effectively reduce spherical aberration and chromatic aberration. It is divided into flat convex cylindrical lens, flat concave cylindrical lens, biconvex cylindrical lens, double concave cylindrical lens, meniscus cylindrical lens, cylindrical intersection cylindrical lens and special-shaped cylindrical lens. It has one-dimensional amplification function. Cylindrical lens is mainly used to change the design requirements of imaging size. For example, convert a point spot into a line spot, or change the height of the image without changing the image width. It can be used in linear detector lighting, bar code scanning, holographic lighting, optical information processing, computer and laser emission. Optical cylindrical mirror is also widely used in high-power laser system and synchrotron radiation beam line. At the same time, the requirements for cylindrical mirror parts are becoming higher and higher, especially in high-precision testing instruments and devices such as cavity plate of high-power laser resonator and long-distance off-line interferometer. Manufacture of cylindrical lens Including rough grinding, fine grinding, polishing, centering and edging.

Prism, a transparent object surrounded by two intersecting planes that are not parallel to each other, used for splitting or dispersing light beams. Prism is a polyhedron made of transparent materials (such as glass, crystal, etc.). It is widely used in optical instruments. Prisms can be divided into several types according to their properties and applications. For example, in spectral instruments, the "dispersion prism" that decomposes the composite light into spectrum is more commonly used as equilateral prism; In periscope, binocular telescope and other instruments, changing the direction of light to adjust its imaging position is called "total reflection prism", which generally adopts right angle prism. Function of reflection prism: when the reflection prism (or reflector) is used as the reflector for ranging, the reflection prism receives the optical signal sent by the total station and reflects it back. The total station sends out the optical signal, receives the optical signal reflected from the reflecting prism, calculates the phase shift of the optical signal, so as to indirectly obtain the time of light passing, and finally measure the distance from the total station to the reflecting prism. Principle of reflection prism: the working principle of reflection prism is actually the reflection law and refraction law of light. When light is reflected in the same medium, its reflection angle is equal to the incident angle; When light is incident from one medium perpendicular to two medium planes to another medium, it will not be refracted.

A lens is made by grinding a transparent material such as glass into a circular sheet so that both surfaces are curved or one side is flat. Its function is to make the beam converge or diverge through the refraction of its two surfaces, and form the image of the object at any required position. Double glue lens is a lens obtained by gluing two lenses together. The combined lens formed by two lenses is an effective method to obtain short focal length, large magnification and better imaging quality. It has been widely used in astronomical telescopes and cameras. Optical microscopy is an ancient subject that has been studied for more than a century. The non-destructive nature of optical microscopy is important in various fields, such as biology and material science. The main disadvantage of ordinary optical microscope is that the resolution is limited by the diffraction limit, and its resolution is an order of magnitude with the illumination wavelength; Another limitation is its limited focal depth. These limitations make it difficult to image objects with a certain thickness using ordinary optical microscopy, so three-dimensional (3D) imaging of thick samples is impossible. In order to improve the resolution of ordinary lens and facilitate confocal 3-D imaging and high-density optical storage, many techniques of super-resolution are proposed by adding pupil filter to the lens of optical system. Such as ring with central occlusion, light leakage ring pupil, phase pupil and grating, etc. These pupils improve the resolution of 2-D imaging, but due to the extension of the focal depth in the axial direction, it is not suitable for confocal 3-D imaging. In addition, due to the method of adding pupil to the lens, the intensity of the light spot is reduced, some even more than 90%, which greatly reduces the signal-to-noise ratio of the optical system. The combined lens formed by two lenses is

An optical lens is a transparent optical component used to converge or diverge light emitted from a peripheral object. The transmitted light rays then form a real or virtual image of the object. Lenses are a good example of transmissive optical components, meaning that they pass or transmit light. Other transmissive components include filters, windows, flats, prisms, beamsplitters, and waveplates, while the opposite category - reflectives (which reflect light rather than transmit it) - include optical mirrors and retroreflectors. Optical lenses have been used since at least c. 700 BCE for a variety of applications, including: Magnification Correction of optical aberrations Use as a firestarter (burning-glasses) Image focusing Image projection Hanzhong Hengpu designs and manufactures optical lenses for industrial, medical, high tech and electronic applications. Standard and custom lens assemblies for scanners, CCTV, CCD/CMOS, medical imaging, surveillance systems, machine vision and night vision systems. Universe Kogaku`s lens application engineers provide your optimal lens solution. We`ll assist you with all of your design considerations-from lens assembly and overall design specifications to budgets and timetables. And we can reduce your project costs with our extensive selection of standard lens assemblies and elements, value-added services for component modifica

The lens is an optical element with a spherical surface made of transparent material. The lens is composed of several lenses, There are plastic lenses and glass lenses Glass lens is more expensive than plastic lens. Generally, the lens structures used for cameras are: 1p, 2p, 1g1p, 1g2p, 2g2p, 4G, etc. The more lenses, the higher the cost. Therefore, a good quality camera should use glass lens, which has better imaging effect than plastic lens, and plays an important role in astronomy, military, transportation, medicine, art and other fields. concept Lens can be widely used in security, vehicle, digital camera, laser, optical instrument and other fields. With the continuous development of the market, lens technology is more and more widely used. (lens) a lens is made according to the refraction law of light. A lens is an optical element made of transparent substances (such as glass, crystal, etc.). A lens is a refractor, and its refracting surface is a transparent body with two spherical surfaces (part of the spherical surface), or a spherical surface (part of the spherical surface) and a flat surface. Its image has both real and virtual images. Convex lens: thick in the middle and thin at the edge, including biconvex, flat convex and concave convex; Concave lens: thin in the middle and thick at the edge, including double concave, flat concave and convex concave. Little formula 1. Lens The lens can transmit light; Middle thick, convex lens; Thin, concave lens in the middle. Convergent convex lens, divergent concave lens. The flat light converges to a point, represented by focus F. The distance from the focal point to the optical center of the mirror is called the focal length of the mirror (expressed by F). 2. Lens in life The object is far like a close camera, the re