good optical stories

One good optical story is about the discovery of lenses. Long ago, people noticed that certain shaped pieces of glass could magnify objects. This led to the development of eyeglasses, which was a huge breakthrough for those with vision problems.

Puyi Eyewear was a high-end eyewear brand founded in Hong Kong. Its price was higher because it was of very high quality, and the materials and craftsmanship used were very exquisite. Pu Yi glasses were designed, produced, and sold by brand manufacturers, so the price was much more expensive than ordinary glasses. Pu Yi Glasses cooperated with many internationally renowned brands to provide high-quality products and services, as well as a luxurious experience. Its stores provided a personalised service, selecting matching styles for each customer, and providing a series of shopping experiences and VIP services. Mr. Qiu Zijie, the founder of Puyi Glasses, shared his experience and ideas in brand management, product selection, and service content. Pu Yi Glasses was based on the personalisation and advanced optometrification and eye protection technology, providing perfect answers for every pair of eyes. Puyi Glasses had been in the market for 18 years and had become the leader of the luxury glasses market.

Here are some ways to take good pictures in optical photography: ** 1. Light usage ** 1. ** Shun Guang ** - Shooting with a straight light could make the scene look bright and clear, suitable for beginners. However, its shortcomings were that the scenery was too flat, the light and dark were not obvious, the main body and the background color were easy to blend, and the picture lacked a three-dimensional sense. Using the camera's rating and light measurement mode could basically take satisfactory photos. 2. ** Side Light ** - The front light (45° angle) was more commonly used in landscape photography. It could make the scene have a certain contrast between light and dark, enhance the three-dimensional sense and the level of the image, and also better for the color reproduction of the picture. - The 90° side light would make the light and dark of the scene half. The contrast between light and dark and the three-dimensional effect were very obvious, and the effect was outstanding when representing objects with uneven surfaces such as buildings. When shooting with side light, measure the brightness of the picture to avoid partial overexposed. 3. ** Backlight ** - Backlighting was a very unique light. It was suitable for displaying scenes with more layers. It could make the parts of the scene that were illuminated by the light produce a bright outline, so that the main body and the background were clearly separated, creating a strong sense of spatial distance. When shooting a backlit scene, if you want to fully display the level of the scene, the exposure time is determined by the dark part of the scene; if you want to get the silhouette effect, the light part shall prevail. 4. ** Glow ** - High light (the light from the sun that shines almost vertically on the ground between 10 a.m. and 2 p.m.) is strong and will cause deep shadows. Moreover, its vertical nature is not conducive to expressing the texture of the object, so it is not suitable for landscape photography. 5. ** Scattered Light ** - Under the scattered light on cloudy days, the subject had no light and dark boundaries, and there were no shadows. The image was easy to appear dull and gloomy. At this time, you can narrow the scope of the scene, take a close-up shot of the middle or partial scene, and use a larger aperture or increase the amount of exposure compensation according to the situation to avoid insufficient exposure. ** 2. The relationship between light and shadow ** 1. Light and shadow exist at the same time in photography. Don't just focus on the light and ignore the shadow. The change of light and shadow was related to the environment. Different materials, object shapes, contours, texture, structure, etc. would affect the light and shadow effect. A good photographer could perceive the changes in the details of light and shadow. 2. Light and shadow could be considered separately for creative ideas. When focusing on light, it could carefully express the subject itself, such as texture, atmosphere, character emotions, etc. When focusing on shadow, it could be separated from the specific object, focusing on the performance of space and picture composition. ** 3. Picture composition and framing (DSLR as an example)** 1. If you used a single-lens reflex camera, its optical viewfinder had an advantage. For example, the Canon 5D4's optical viewfinder had a 100% field of view. The scene you saw was what was taken, and the composition was more accurate and realistic. 2. When framing the composition, pay attention to the beauty of the picture and avoid elements that destroy the beauty of the picture. For example, when the distant view in front of the character destroys the beauty of the picture, you can use a large aperture to blur the distant view. ** 4. Other aspects ** 1. Different weather conditions had different lighting conditions. Even if it was not the prime time of sunrise and sunset in the morning and evening, there might be good lighting conditions in ordinary weather, which required the photographer to be sensitive. 2. He could observe more excellent photography works, analyze their ideas, and accumulate experience, thus improving his creative inspiration in optical photography. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The hood was a device installed at the front of the camera lens, digital camera, and video camera. It was an important part of the lens optical system. Its main uses included: 1. ** Suppression of stray light **: avoid glare and improve image clarity and color reproduction. In different light positions such as backlighting, side backlighting, forward lighting, side lighting, lighting photography or night photography, it can prevent non-imaging light, surrounding scattered light or interference light from entering the lens, avoid fog and halo phenomena, and improve the color saturation and clarity of the picture. 2. ** Protect the lens **: When the lens is accidentally dropped, it can help reduce the damage caused by the fall; it can prevent fingers from accidentally touching the surface of the lens; it can also block the sand, rain, snow, etc. to a certain extent to prevent other things from directly touching the surface of the lens. In terms of usage, the hood in front of all the lenses had been carefully calculated by the manufacturer to help improve the quality of the shot. If the lens was equipped with a crystallizer, although the crystallizer and the hood had no similarities, the hood still needed to be installed. When rotating the crystallizer, the hood could be turned upside down and buckled on the lens, or temporarily removed and placed in the camera bag. It was not necessary to buy the original hood. Buying a hood that matched the lens 'caliber and angle of view could play its role. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The following is some common optical parameters on the lens: 1. ** effective focal length (EFL)**: The distance from the center of the lens to the focal point. It could be divided into image focal length (the distance between the main surface of the image and the focal point of the image) and object focal length (the distance between the main surface of the object and the focal point of the object). If the focal length is too short, it will cause the field of view to be too large, causing distortion, difficulty in controlling the angle of the chief ray, low contrast, serious lens bending, difficulty in correcting the phase difference, and other problems. If the focal length is too long, the lens will be too long, which is not conducive to the miniaturized system. Moreover, the field of view is too small to meet the user's needs (FoV>60°). 2. ** Total length of lens (TL)**: It is divided into optical length (the distance between the first surface of the lens and the image surface) and mechanism length (the distance between the end of the lens barrel and the image surface). 3. ** Back focal length (BTL)**: The distance from the last side of the lens in the optical system to the image plane. 4. ** Front focal length (FFL)**: The distance from the first surface of the lens to the object surface in the optical system must be distinguished from the back focal length of the mechanism. 5. ** Mechanical back focal length (FTL/FFL)**: The distance from the last mechanical surface of the lens group to the image surface. 6. ** Field of View (FoV)**: The largest field of view that the camera can capture. It can be divided into diagonal field of view (FoV-D), horizontal field of view (FoV-H), and vertical field of view (FoV-V). The diagonal field of view is the largest, followed by the horizontal field of view, and the vertical field of view is the smallest. The so-called field of view refers to the diagonal field of view of the digital camera module. The size of the field of view was related to the focal length. Generally, the larger the field of view, the shorter the focal length. 7. ** Joules (F/NO.)**: It was the ratio of the effective focal length to the diameter of the pupil, which was used to determine the brightness of the lens. Under the premise of ensuring the same aperture, the shorter the focal length, the smaller the relative aperture should be. In general, the smaller the F/#, the larger the aperture. 8. Distortion: It is the off-axis phase difference. It is the height difference between the intersection point of the off-axis point and the main ray on the image plane and the ideal (paraxial-like) image plane. It is a function of the field of view and has nothing to do with the aperture. Distortion was divided into TV distortion and optical distortion. TV distortion was further divided into pillow type and cylinder type. Distortion is the image quality that users can easily feel. Different application scenarios have different requirements for distortion. For example, Optical-Distortion <3% is not easy to detect by the human eye, and the objective lens generally requires Optical-Distortion <2%. 9. ** relative illumination (Ri)**: The ratio of the central illumination to the peripheral illumination. If the contrast was too low, the center of the image would be bright and the surroundings would be dark (vignette phenomenon, commonly known as dark corners), which would also cause color distortion. The Ri is directly proportional to COS4 (semi-fov). Different semi-fov correspond to different theoretical values of the Ri. When the Ri<50%, the human eye can distinguish it. In serious cases, the four corners of the picture will be completely black. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The optical parameters of the camera included the following aspects: 1. ** focal length **: This is a very important optical parameters of the lens. It refers to the distance from the main point of the lens to the focal point. It is an important performance indicator of the lens. The length of the focal length of the lens was inverse to the size of the image taken by the lens. That is, under the same object distance, the larger the focal length of the lens, the smaller the size of the image taken. Most industrial cameras use fixed-focus lenses in practical applications. Before choosing the focal length of the lens, you need to know the object distance of the on-site camera (the installation height of the camera lens from the surface of the measured object) and the field of view of the camera (the size of the characteristics of the measured object). In some applications involving the mixed inspection of objects at different heights, the use of a variable focal length lens would be considered. However, the variable focal length lens had two issues to consider: zooming speed and lens life. 2. ** Depth-of-field **: When the focal length of the lens is adjusted to a focal point, only the objects within a certain distance before and after the focal point are clearly visible. The objects outside this distance are blurred. This distance is the depth of field of the lens. 3. ** Pieces and resolution **: Pieces are the smallest unit of an image generated by the imaging chip, such as a 2-million-pel image. The resolution referred to the imaging ability of the CCD-or CMOS-chip. For example, the resolution of a 2-million-pel camera was 1626 x 1236, which meant that the camera had 1626 x 1236 rows in the X-axis direction. The total image taken was about 2 million pel. The detection accuracy could be simply evaluated by dividing the actual size of the image's X-axis by the number of X-axis dots. However, the final detection accuracy was affected by many factors, including the moving speed of the object being measured, light interference, the shape of the object, the contrast of the features, the computing power of the software, and so on. 4. ** Picture element size **: This is also an important optical parameters of the camera. 5. ** Target size of sensor **: It is the most concerned part of the camera's optical parameters. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Bengbu Ciyt Changtian Optoelectronic Technology Co., Ltd. has optical lens blank and optical lens project. In addition, Bengbu had a certain development in optics-related industries. For example, there were companies involved in optical lens coating technology. For example, Bengbu Ciyt Optoelectronic Technology Co., Ltd. developed an optical lens coating device that could coat optical lenses of different sizes and automatically flip them over to coat them on both sides. There was also a device for processing optical lenses that automatically controlled the amount of polishing liquid squeezed out. There were also companies that planned to invest in the construction of optical module industrial base projects. For example, Laitong Optoelectronics Co., Ltd. planned to invest 1.36 billion yuan in the construction of upstream and downstream industrial bases including optical lenses. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The optical lens was a very important component in the machine vision system. It was directly related to the quality of the image and also affected the implementation and effect of the algorithm. In terms of focal length, it could be divided into short focal length lens, medium focal length lens, and telephoto lens. According to the size of the field of view, there were wide-angle lens, standard lens, and telephoto lens. In terms of structure, it could be divided into fixed-aperture fixed-focal length lens, manual fixed-aperture fixed-focal length lens, automatic fixed-aperture fixed-focal length lens, manual zoom lens, automatic zoom lens, automatic aperture electric zoom lens, and electric three-variable (aperture, focal length, and focus can be changed) lens. In the security field, large foreign manufacturers (such as Canon, Nikon, and other Japanese manufacturers) had monopolized the source of lenses for a long time. However, in recent years, domestic lenses (Sunny Optics, Yutong Optics, United Optoelectronics, Fuguang, etc.) have risen. In the middle and low-end market of the security field, domestic companies have occupied an absolute proportion. However, foreign companies (such as Tenglong, Fujineng/Fujinlong, etc.) still have a certain degree of competitiveness in the high-end market. For example, in 1978, Fuji was able to produce the first HD lens and had maintained a leading position in the field of high-end lenses. In terms of global market revenue, the combined revenue of the optical lens industry in the video surveillance, smartphone, and car camera fields in 2017 was nearly 6 billion US dollars. It continued to grow between 2018 and 2019 and was expected to exceed 7 billion US dollars in 2021. In addition, Jiangxi Lianyi Optics Co., Ltd. obtained a patent called "optical lens" on October 19,2024, with the authorization announcement number of CC118348660B. There was also an Atlas of Aerial Photographic Optic Lenses "Russa", which contained the optical structure drawings and main aberrations of almost all the aerial photographic optical lenses "Russar" designed by the Russian scholar Professor Rusinov. The attached table also listed the design parameters (lens curvature radius, optical materials, etc.). It was suitable for optical system design and calculation experts, engineering technicians, university teachers, graduate students, and aerial photography optical enthusiasts. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

There were many optical lens related companies in Beijing, such as Bo Li (Beijing) Optoelectronic Technology Co., Ltd., Xi Bi Xi Optics (Beijing) Co., Ltd., Beijing Goppu Optoelectronic Technology Co., Ltd., etc. In terms of the optical lens industry, there were optical, optical mirrors, lenses, light sources, photoelectricity, lasers, 3D cameras, artificial intelligence, instruments/meters, photolithographic machines, etc. The proportion of optical, optical mirrors, and lenses was 7.1%, and the proportion of light sources, photoelectricity, and lasers was 4.8%(data for reference only). <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Well, there was a person who chose Optical Express for their cataract surgery. The surgery took place, but then they started experiencing intense light sensitivity that they hadn't had before. They called the clinic multiple times, but it took a long time to get an appointment for a follow - up. By the time they were seen, the problem had worsened. It turned out that there was some misalignment during the surgery that could have been corrected earlier if the clinic had been more responsive.