Mechanical structure of lens
The mechanical structure of the lens consisted of several parts: 1. ** Tubes **: Many optical and other components of the lens are installed in the tube. Some mechanical parts (such as focusing devices and lens mounts) are also installed on the tube. The lens barrels were either sturdy (like the classic lenses of the Leicas and Hassel) or light (like the lenses of pocket-sized digital cameras). In the model of the telescope lens, the lens barrel was an optical mechanical structure with a high degree of mechanical strength. A typical telescope lens was made up of two or three concentric lens barrels of different diameter. It was called the "lens skirt". Its design was related to the size of the internal lens. For example, if the lens size was small, the "lens skirt" could be increased as appropriate. The fewer the "lens skirts", the stronger the lens. 2. ** Front mount **: Usually used to install filter and lens hood. If the front interface is rotated when the lens is focused, it may cause trouble for the filter (such as causing a problem with the light). Pocket camera lenses can be equipped with an adapting ring on the outside of the lens barrel to use other lens accessories. 3. ** Focus Ring **: There is usually a focus ring on the changeable lens, but the autofocus lens usually doesn't have one. The focus ring could start the optical components to focus, or drive the micro-motor to operate the optical components (this method was commonly used in digital cameras, and the focus felt very light). 4. ** Back Interface **: Connects the lens to the camera body to achieve interaction. It must be extremely precise and sturdy enough (frequent loading and unloading of the lens will cause wear and tear). The rear interface of a modern lens was also responsible for the data transmission between the lens and the body. There was an electronic interface (automatically adjusting the aperture by transmitting digital data) and a mechanical interface (used to drive the focusing system or aperture adjustment device). The electronic interface had to be kept clean and not contaminated by grease. 5. ** Aperture **: The aperture control device is usually located on the lens barrel of the changeable lens. It can also be controlled by the dial on the camera body. All lenses can be adjusted in units of 1 stop. Professional photography often requires more precise adjustment (such as 1/2 stop or even smaller). 6. ** Zooming control structure **: There are two zooming methods, rotating ring (such as focusing ring) and push-pull ring. The push-pull ring method may allow air to enter the camera and suck in dust. The autofocus pocket camera controls the zooming through the body switch. 7. ** Inter-lens Shutter (partial lens)**: This is used for the lens of medium and full-frame cameras. The shutter is placed between the lens blades and can be set by the lens or the camera body. Most of the shutter lenses used mechanical drive control, while some of the shutter lenses used electronic drive control. In addition, the mechanical structures in the lens, such as the transmission parts of the aperture, required sensitive response and accurate positioning.(Especially for the automatic lens used in the single-lens reflex camera, pay attention to whether the aperture can automatically shrink to the predetermined aperture, especially whether the smallest aperture is shrunk in place); For the focusing mechanism, the rotating focusing ring hand is stable and smooth. When adjusting to the shortest shooting distance, hold the lens barrel up and down and shake it gently. The lens should not be loose, otherwise, there may be a large gap in the focusing mechanism or there may be problems. Read more exciting novels for free
Classic lens optical structure
The following are the optical structures of some classic lenses: 1. Single-piece lens (one set, one piece): It was first invented by the Englishman Wollaston in 1812. It had a maximum aperture of F16 and was called a crescent-shaped landscape lens. Its structure could not change the aperture. It was mostly used in early simple box-type cameras (mainly for artists to draw pictures). This structure was similar to the structure of the human eye, but because the camera lens only had one lens, the image would have problems such as spherical aberrations, color aberrations, and coma. Lenses with this structure were commonly seen in presbyopic glasses, but strictly speaking, presbyopic glasses could not be called lenses. 2. **1 set of 2 lens structure **: invented by the Frenchman Chevalier in 1821. It was an achromatic lens with a maximum aperture of F14. It was also a lens with a non-changeable aperture. It glued the concave lens and the concave lens together to eliminate some of the color aberrations. In 1839, the Kilux camera invented by Daguerre used this kind of lens. 3. ** Petzval structure (3 sets of 4 pieces)**: In 1840, the Austrian mathematician Professor Petzval used mathematical methods to design a portrait lens with a maximum aperture of F3.7. This structure of the lens is still popular today. 4. ** Double Gauss structure **: It appeared during World War II. 5. [Heavenly Sai structure: 100 years of history.] <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The internal structure of the movie lens
A lens was composed of lenses, zooming rings, focusing rings, aperture blades, scale distance, bayonet, auto/manual focus selection, image stabilization switch, and other components. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The lens structure, the surveillance camera
In terms of the structure of the surveillance camera lens, it could be divided into a large lens and a small lens. The lens had two important parameters, namely the focal length and aperture. The focal length was usually 4mm, 6mm, 8mm, 12mm, etc. The larger the millimeter, the smaller the range, but the further the distance. For example, the warehouse usually used a 4mm lens, the residential building unit door usually used a 6mm lens, and the small road usually used a 12mm lens. The aperture was the F value that appeared on the lens, generally F1.0, F1.2, F1.4, F1.6, etc. The smaller the F value, the greater the amount of light, and the more expensive the lens. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Mechanical single-lens reflex photography
Mechanical single-lens reflex photography involved many aspects. In terms of the operation process, there were several steps: measuring light, setting exposure, composition, focusing, and shooting. In terms of light measurement, modern single-lens reflex cameras generally had automatic light measurement and a variety of light measurement modes. When operating, press the shutter button halfway, place the subject you want to shoot in the center of the viewfinder, and the camera will automatically measure the light. The camera also had an exposure ruler as a graphic reference tool, which was usually visible in the bottom row of the optical eyepieces of the DSLR camera. Generally, when the moving cursors were in the middle of the exposure ruler, it was the correct exposure state. However, when the object to be measured was white or black, the principle of "white plus black minus" should be followed. That is, the white object should keep the cursors in the relatively overexposed measurement range, and the black object should keep the exposure ruler in the relatively underexposed measurement range to make the subject exposed normally. The exposure setting can be done by referring to the measurement results and the exposure ruler. The composition was to arrange the layout of the picture elements according to the shooting needs and creativity. Focus was to ensure that the subject was clearly captured. Finally, the filming began. From the perspective of the equipment itself, mechanical single-lens reflex cameras had their own unique features. However, at present, single-lens reflex cameras were facing some situations. For example, since the outbreak of the epidemic in 2019, the price of many digital products had changed. The price of camera lenses had increased many times, and the production of single-lens reflex cameras and lenses had basically stopped updating. However, the demand for single-lens reflex cameras was still strong, which made the popularity of single-lens reflex cameras in the second-hand market unabated. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The structure of the picture, the lens, and the sound in the movie is called
In movies, the structure of the image, lens, and sound was called the relationship between sound and picture. It mainly included three types: synchronization of sound and picture, separation of sound and picture, and counterpoint of sound and picture. Sound and picture synchronization meant that the visual image in the picture and the auditory image of the sound were consistent in time and space. For example, when the character in the picture spoke, the sound and the mouth shape were exactly the same. The separation of sound and image was the independent development of sound and image, but they also interacted with each other. For example, in a quiet scene, the narration voice was telling the inner thoughts of the character. Sound and picture counterpoint was originally a musical term. Borrowing it from movies, it referred to the combination of sound and picture in which the image and sound expressed the content separately. The two developed according to their own laws, and each explained the same meaning from different aspects with their own unique internal rhythm. It emphasized the interaction between the sound and the picture. Through the audience's association, it achieved the effect of contrast, symbolism, metaphor, etc., and produced a new meaning that the sound and the picture did not originally have. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Calculating the Reaction Force Formula of the Bearing in the Mechanical Structure
1. For fixed bearings (hinged bearings): - In the horizontal direction, the support reaction force is zero because the fixed support (hinged support) can prevent the object from moving horizontally. - In the vertical direction, the reaction force of the support is equal to the gravity of the object. 2. For sliding bearings: - In the horizontal direction, the reaction force of the support is equal to the horizontal force exerted by the object on the support. - In the vertical direction, the reaction force of the support is equal to the gravity of the object. 3. For rolling bearings: - In the horizontal direction, the reaction force of the support is equal to the horizontal force exerted by the object on the support. - In the vertical direction, the reaction force of the support is equal to the gravity of the object. 4. For a simply supported beam structure (take the concentrated force acting in the middle of the simply supported beam as an example): If a concentrated force acts in the middle of the simply supported beam, according to the knowledge of structural mechanics, the support reaction force at both ends is the same, and the magnitude is half of the concentrated force. For example, if the concentrated force is F, then the reaction force of both supports is F/2. 5. For the frame structure (let the angle of the upper and lower chords of the frame be a, and the force of the first and second members be N1 and N2 respectively, when the external force of the structure is balanced): - x = 0 = xA = 0; - If Y = 0, then Ya+Yb = 4P (assuming the total external force is 4P), then Ya = Yb = 2P by using the carrier and the shape. It should be noted that the above formula only applies to mechanical systems under static conditions. In actual engineering, other factors such as friction, bending, and shear should be considered in the calculation of bearing reaction force. Therefore, in the specific problem, the calculation formula of the support reaction force needs to be determined according to the specific situation and the results of the force analysis. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Mechanical analysis of the double-curved reflective antenna structure
This paper uses the finite-element method to analyze the structure of the double-curved reflective antenna. The main ways to reduce the weight of the antenna system are proposed, and some practical mechanical calculation results are provided. However, the document did not elaborate on the specific application process of the finite-element method and the specific content of the weight reduction method and mechanical calculation results. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The mechanical arm of the mechanical priest
The Mechanical Priest's Mechanical Arm was an item from the novel Lord of Mysteries. It was the Beyonder power of the main character, Klein Moretti. The mechanical arm was made of steel and leather and could perform all kinds of complicated actions, such as holding weapons and operating machinery. It was obtained by Klein during a mysterious incident. It originally belonged to a believer of the ancient God of Machinery. The core of the mechanical arm was a mysterious rune that could provide powerful strength and magic power. Klein could control the mechanical arm through his thoughts, allowing it to carry out various missions. He could change the mechanical arm into various shapes, such as claws, hammers, whips, etc., to adapt to different combat needs. The mechanical arm could also fuse with Klein's body, increasing his strength and speed. In short, the Mechanical Priest's mechanical arm was a very powerful weapon that provided Klein with great help in battle. Hurry up and click on the link below to return to the super classic " Lord of Mysteries "!
The lens barrel of a photographic lens
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>
What is the lens of the camera lens?
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>