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Canon lenses and Nikon lenses were well-known brands in the field of camera lenses. In terms of Nikon lenses, the new Z-mount lenses were generally of high quality, such as holo-field compatibility and excellent corner resolution. The F-mount was limited by the caliber and the distance between the two sides, while the Z-mount had a great improvement in this aspect, especially in the wide-angle to mid-focal length section. Canon lenses, such as the RF28 - 70mm F2.8 lens, had a constant large aperture of F2.8. It was portable, and the image quality was average, even a little beyond the positioning of the silver ring lens. It also had anti-shake function. However, its price was sometimes affected by marketing routines. For example, during the 11/11 period, the price of Canon RF28 - 70mm was higher than the recommended price on the official website and did not return to normal value. These two lenses had their own optical design features, advantages, and market positioning under different camera mount systems. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Based on context alone The lens of the camera lens was made up of many different types of lenses. This included a concave lens, which had a thick middle and thin edge structure. It had a converging effect on light, which helped to focus the light on the imaging plane, making the image clear. There were also concave lenses, which were thin in the middle and thick at the edges. They had a diffusing effect on light and were often used to correct aberrations. In addition, there were also aspheric lenses. These lenses were not the traditional spherical shape. They could better correct aberrations, improve image quality, and reduce image distortion and blurring. They were widely used in modern camera lenses. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The lens barrel was an important part of the camera lens. Different lenses had different characteristics, such as: 1. ** Material **: - Some lenses were made of metal. For example, the 90mm F2.8DG GN lens of SIGMAR was made of an all-metal lens barrel. This material helped to improve the durability of the lens and was suitable for a variety of shooting environments. - Some of the lens barrels might be made of alloy materials. For example, some of the new Soviet Union's "Ubi 'er" 85/2 lenses were made of brass or alloy. They were heavy and durable in the hand. 2. ** Function **: - The design of the lens barrel would affect the lens's mobility. For example, the Nikon z24 - 70mmF/4s and z14 - 30mmF/4s were designed with a foldable lens barrel. When not in use, the length of the lens could be reduced as much as possible for easy storage. - The lens barrel was also related to the sealing performance of the lens. Like the 70 - 200mm lens, many of them were equipped with a metal lens barrel and a rainproof seal. This sealing performance allowed the lens to shoot in rain, sleet, or snow, improving the lens 'ability to cope with different weather conditions. 3. ** Relationship with other parts **: - The structure of the lens barrel was related to the optical structure inside the lens. It provided support and protection for optical components such as lenses. For example, the 10 sets of 15 optical structures of the SIMAHA 90mm F2.8DG GN lens were installed inside the lens barrel. The lens barrel provided space for the reasonable layout of these lenses to ensure the normal operation of the lens. - The design of the lens barrel was also related to the type of lens mount. Different lens barrels would fit different mounts, such as the SIGMA-90mmF2.8DGGN.| The lens barrel should be designed to meet the requirements of accurate docking and stable connection with these two mounts. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The angle of view of the medium focal length lens was between 40 degrees and 18 degrees, and the focal length range was between 61mm and 135 mm. The angle of view of a standard/medium-focus lens was about 40 - 55 degrees. In terms of optical characteristics, the photos taken at this focal length had the least distortion and could accurately reflect the shape of the subject. It was also relatively easy to design a large aperture. Different models of medium-focal lenses had different performance parameters in terms of distortion, dispersion, resolution, contrast, and so on. For example, the Olympus OM Zuiko auto-macro 90mm f/2.0 lens had an actual focal length of 90.44mm, an aperture of f/2.04, a pincushion-shaped distortion of 0.47%, and an edge loss of 0.3 stops at f/5.6. Minolta MC Rokkor -85mm f/1.7 lens, the actual test focal length was 85.6mm, with 0.5% barrel distortion, etc. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Some data showed that the telephoto projection could be used to change the camera lens into a projection lens, and a size image could be projected at a distance of 1.5 meters. He could also use a flashlight as the film's back light and a Nikon lens as the projection lens to make a simple projector and project the reverse film on the wall. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

If you want to remove the lens of a camera lens, here are some common steps: 1. Before doing anything, first make sure that the camera's power is turned off to avoid accidents. Prepare the necessary tools, such as a screwdriver, tweezers, and cleaning tools. 2. Removing the lens cover: The lens in front of the lens is usually protected by a lens cover, which needs to be removed first. Carefully use your fingers or tools to gently rotate the lens cover until it is loose and can be completely removed. 3. Loosening the fixing screw: Under the lens cover, there are usually a few fixing screws that hold the front lens. Use a suitable screw driver to loosen these screws, but do not completely remove them. 4. Removing the lens: After the screw is loosened, you can carefully use tweezers or fingers to remove the lens from the lens assembly. Make sure not to touch the surface of the lens to avoid leaving fingerprints or scratches. Different types of lenses might have different structures, so they needed to be handled carefully during the dismantling process. If you are not familiar with the operation, it is recommended to seek professional help. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Canon's 800mm fixed-focus lens cost about 84,000 yuan. It was a lens for top professional users. It looked particularly large and heavy. After installing the 5D4, it was estimated to weigh more than 5 pounds. There were a lot of control buttons on the side of the body, making it easy to switch between focusing mode and focusing distance. In terms of image quality, the in-focus was clear and sharp, and the out-of-focus melted like cream. However, the high price and limited usage made it relatively niche. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The lens of the movie projector was a concave lens, which would be used during the movie screening process. However, based on the current information, it was impossible to pinpoint which movies specifically used concave lenses to achieve special effects other than projector lenses. It was possible that many movies would use lens combinations that included concave lenses during the shooting process, such as the anamorphotic lens combination that included concave lenses, but it was difficult to identify specific movies. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Telephoto lenses and macro lenses had their own advantages and disadvantages. The choice of lens depended on the shooting requirements and the shooting environment. The focal length of a telephoto lens was longer than a standard lens. Usually, a telephoto lens was between 135mm and 300mm. It could be divided into ordinary telephoto lenses (85mm-300mm) and super telephoto lenses (300mm and above). It was suitable for shooting long-distance scenes or subjects, such as wild animals, people, urban landscapes, or mountain views. It could blur the background and background to strengthen the subject, and could also be used for close-ups or to highlight the difference in size. In terms of macro shooting, the telephoto lens could shoot small objects at a certain distance to avoid disturbing the subject, such as insects or wild animals. The background blurring effect was obvious and the details were strong. However, telephoto lenses usually had a small aperture, high light requirements, and high hand-held stability requirements, which made them prone to shaking. The macro lens was specially used to shoot small objects at a close distance. It could make the subject occupy the entire picture, and the details were very prominent. It could capture the fine details of the object at close range, and it could highlight the main object by adjusting the depth of field when shooting. However, the working distance of the macro lens was short, which might disturb the subject or block the light. The background control was relatively difficult, and the background blurring effect was relatively weak. If you often shoot long-distance objects or want to shoot macro without getting close to small objects (such as shooting insects that are not easy to approach), a telephoto lens is more suitable. If you focus on shooting small objects at close range to show extreme detail, a macro lens is more suitable. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The following factors can be considered when choosing a car lens: 1. ** Usage scenario **: - The lens design was different for different car cameras. If the functions of the car's front view, surround view, and DPS lens were different, there would be differences in design. For example, Hongjing Optoelectronics 'forward-looking, binoculars, and DPS lenses used f-tan 0 ortho-projection, focusing on the guarantee of optical main points, etc., while the surrounding lens used a Holographic model design to ensure a high density of surrounding graphics. The In-Cabin lens in the cabin would use different band options and possibly RGBI-R Confocal design. - The functions of imaging cameras (surround view, rear view, built-in camera) and sensory cameras (front view, side view camera) were different, and the lens requirements were also different. The imaging camera was used for panoramic parking, reversing, monitoring the driver's status, etc. The sensory camera was used to provide lane departure warning, blind spot monitoring, and other functions. 2. ** Optic performance index **: - The quality of a lens could be measured by optical parameters such as focal length, aperture, distortion, and resolution. For example, distortion would affect the degree of distortion of the image. In the application of vehicle vision, optical companies needed to indicate what kind of distortion model was used on the specifications because the distortion model would affect the difficulty of the algorithm and the success rate of the verification. Different lenses, such as DV, Front, LM, RVP and other conventional lenses, often used f - tan theta-orthography;Fisheye fisheye lenses often used f -theta-equidistance projection; AVI and other surround lenses often used 2*f*tan(theta-theta2) three-dimensional projection. - With the upgrade of the image quality, the number of aspheric glass lenses needed to be combined in the lens increased to reduce aberrations. The curvature and diameter of the lens could be adjusted, and the technical requirements for manufacturers increased. At present, the 8M camera needed to combine multiple aspheric glass lenses with spherical glass lenses. 3. ** Adaptability to the environment **: - The car lens had to meet the requirements of the complex use environment, such as the need to be exposed to harsh environments for a long time (strong light, sand, rain, mud, etc.), so it had to be able to meet high and low temperature impact, corrosion resistance, vibration resistance, waterproof and salt fog resistance tests. - Compared with plastic lenses, glass lenses had the characteristics of high heat resistance, low distortion, high light transmission, and high refraction index. The imaging effect was better, and the influence of thermal difference was small. It was more in line with the harsh working environment and high performance requirements of the car lens. Therefore, the car lens was mostly all-glass lens or glass-plastic hybrid lens. Generally, the front view lens, high-resolution lens, etc., which had high performance requirements, were more inclined to glass lenses. 4. ** Adaptability with the algorithm **: - Different optical distortion design models would facilitate different algorithms. For example, the optical distortion design model for different application scenarios was convenient for stitching algorithms and visual effects, and the band selection for different application scenarios was convenient for recognition algorithms and visual experience. 5. ** Anti-stray light ability **: - In practical applications, the car lens would face a variety of light environments, and it was prone to stray light. For example, the "ghost" phenomenon when taking photos with a mobile phone could also appear in the car camera. This required the lens design, material selection, and other aspects to consider reducing the generation of stray light and ghost images, such as optical design simulation, coating process, structural design optimization, and so on. 6. ** Special Function Requirement **: - For example, in order to cope with the impact of the weather on the imaging and recognition of the lens, the lens and camera module should have an automatic auxiliary heating function to quickly remove the water, ice, frost, etc. on the surface of the lens. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>