What are the uses of a camera lens?
Different cameras had different uses: 1. ** Standard lenses (e.g. 50mm for 135mm cameras, 75mm for 120mm cameras)** - The angle of view was about 45 degrees, and the imaging effect was similar to that of the human eye, including the range, size, and perspective. - The image quality was relatively good. 2. ** Wide-angle lens (focal length smaller than standard lens)** - The angle of view was large, and the depth of field was large. It could make the near and far distance of the scene shrink sharply, bringing a strong sense of perspective. It was suitable for taking photos of large scenes such as landscapes, buildings, and group photos. For example, the 28mm wide-angle lens was suitable for general life photos, travel photos, group photos, landscape photos, etc. The 35mm wide-angle lens was also suitable for such scenes. - The scene was distorted, especially at the edge of the picture, but some special wide-angle lens distortion effects could also be used for artistic creation. 3. ** Telephoto lens (focal length greater than standard lens)** - The small angle of view and the small depth of field were beneficial for capturing images that combined virtual and real, making the front and back scenes more compact on the screen, compressing the depth of the perspective of the screen. The image distortion was small, and it was suitable for portrait shooting. - It was divided into fixed-focus lenses (the focal length was fixed, the structure was simple, and the quality was high) and zooming lenses (the focal length could be freely adjusted within a certain range, and the scope of application was wide). 4. ** Fish-eye lens (Field of view angle is greater than or equal to 180 degrees, in fact, it is super wide-angle)** - For example, the 8mm fisheye lens could shoot spherical images with a 180-degree field of view, and the distortion was extremely serious. The 16mm fisheye lens had a barrel-shaped distortion on the left and right, and it had a 180-degree field of view, which was suitable for shooting big scenes and exaggerated descriptions. 5. ** Shifting camera lens ** - It can tilt the lens up and down, left and right, and pan to change the line perspective and focal plane. 6. ** macro lens ** - It was used for ultra-close photography. Different focal lengths of the macro lens were suitable for shooting different objects. For example, 60mm was suitable for shooting flowers and plants, motionless creatures, replicas, small commodities, copies, one-to-one; 90mm was suitable for shooting flowers and plants and general ecology, one-to-one. 7. ** Reflex lens ** - It was small, light, and colorless. It was an ultra-telephoto lens. The objects outside the focal point would appear to be blurred (after two reflections, they would reach the film, and there was only one aperture, so the aperture size could not be adjusted). 8. ** Zooming lens (such as 17mm-35mm, 18mm-35mm, etc.)** - It has the advantages of avoiding frequent lens replacement, reducing the number of lenses, convenient carrying, convenient composition, and so on. - It had the disadvantages of small effective aperture, the viewfinder screen was not as bright as the fixed-focus lens, the focusing was inconvenient, and the image quality was worse than the fixed-focus lens. - It can be used in different scenes according to different zooming ranges. For example, 24mm-70mm is suitable for general scenery, architecture, life photos, travel photos, portrait photos, etc. Read more exciting novels for free
The lens and camera interface
The lens and camera interface was a component used to connect the lens and the camera. Suzhou Ouka optical instrument factory specialized in the production and development of a camera interface, this interface can be connected to different brands and models of lenses, so that the camera can be used normally. There are many types of industrial camera cable ports: - **USB port **: It is a commonly used port for digital cameras. It can directly output digital image signals. USB was the full name of Universal serial bus. The interface was 4-pin, including 2 power cables and 2 signal cables. There were different versions of USB. The early USB2.0 interface was convenient and widely used, but the transmission rate was slow (480Mbit/s), the communication distance was short (5m), and the band width was mostly used for image transmission (80%). The transmission required the CPU to participate in management and consumed a lot of resources, and the interface was unstable. USB3.0 added two sets of data lines on the basis of USB2.0, which were backward compatible. The transmission speed was increased to 4.8Gbit/s, and the communication distance was extended to 10m. However, the transmission distance was still relatively short. USB interface cameras were easy to use and had a wide range of ports. They were widely used in microscopes, scientific research experiments, portable equipment, and other industries. At present, USB Type Micro-B ports were the mainstream on industrial interface cameras. In the future, USB Type C ports might be popularized. - ** IMEE1394 (Firewire Interface)**: It is a high-speed serial bus. It supports hot swapping, real-time data transmission, and uses a bus structure. It is widely used in the industrial field. It has good protocol and coding methods, and the transmission speed is stable. The 1394a's maximum transmission speed was 400mps, and the 1394b's maximum transmission speed was 800mps (3.2mps was relatively rare). Its interface was divided into 4-core and 6-core. The 4-core contained two pairs of data cables, and the 6-core had a set of power cables in addition to the data cable. This interface did not require a controller and could be used for peer-to-peer transmission. The 1394a's maximum transmission distance was 4.5 meters, and the 1394b's transmission distance was usually 10 meters (100 meters, 100 Mbit/s, when the data rate was reduced). However, the interface's penetration rate was low and it had been slowly eliminated by the market. - **Camerlink interface **: A digital image signal communication interface protocol introduced by the Aia Association. It is a serial communication protocol that uses the LVVS interface standard. It was developed from the Channel Link technology, adding the transmission control signal and defined the relevant transmission standards. The protocol used the MDR - 26-pin connection or the SAR- 26-pin connection, which had high speed (up to 6400Mbps), strong anti-interference ability, and low power consumption. However, it required a separate CameraLink interface, which was not portable, expensive, and rarely used in practical applications. - ** Gige Giga-bit ether interface **: created and promoted by Aia. It is a camera interface standard developed based on the Giga-bit ether communication protocol. It is suitable for industrial imaging applications. It can transmit uncompressed video signals over the network and can use low-cost cables to transmit images over long distances. In addition, in the field of machine vision, other data transmission ports were also developed: - **CoaXPress (CXP) interface **: launched in 2008, supports high-speed imaging applications, uses 75 Omega coax cable, supports data transmission speed of up to 6.25Gbit/s per channel, and can increase the transmission rate of multiple channels. Each cable can provide up to 13W of power. It requires the "device" and "host" to support the GenICam camera programming interface. However, the cost of installing multi-channel cable components and frame clips on a single-channel coax cable increases rapidly. - **CameraLink interface **: In 2000, it was launched by Aia Association and gradually upgraded.（2.04Gbit/s）、Medium (5.44Gbit/s) and Deca/Extended (6.8Gbit/s). Base uses an ADC- 26 pin, medium/full requires a second cable to double the capacity, Deca/Extended can transmit up to 6.8Gbit/s data, and like the CXP interface, it requires an image acquisition card that is compatible with the CameralLink power supply (PoQL) standard for power supply. It lacks error correction or resend functions. The cable setup was expensive and troublesome. - **GigE Vision standard interface **: It is managed by the Aia Association and allows the use of existing low-cost ether cables, connections, switches, and other components. Copper cables can transmit image data up to 100 meters away, and more data can be transmitted through the switch and optical fiber adapters. It has the potential to create different network topologies. Each camera can be placed on the network independently through an IP address. It can be viewed, controlled, and monitored from any PC on the network. However, the maximum 115mb/s has limitations for certain applications. However, NBUSE-T technology could increase the band width within its framework. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The camera lens is expensive
In the field of photography, expensive lenses had their value. Generally speaking, more expensive lenses had higher performance in terms of optical quality, workmanship, and performance. For example, in the field of medium and long focal length lenses, Canon's RF70 - 200mm f/2.8L IS USM was priced at 16999 yuan, and the Sony70 - 200mm F2.8GM OSS II was priced at 18999 yuan. These lenses were expensive, but they could provide better imaging results, excellent focusing performance, and good durability on their respective cameras. However, with the changes in the photography market, the relationship between price and value did not completely follow the traditional principle of "you get what you pay". In the micro-monocle era, although some high-end lenses had improvements such as quieter focusing, better design, and improved electronic functions, compared to similar lenses in the DSLR era, users felt less about the improvement in optical quality, but the price generally rose. Some of the affordable entry-level lenses, such as the 50mm f1.8 lens, were no longer as affordable as before. Branded lenses of this size were even hyped up to three times the release price. 24 - 105mm f4 or similar lenses were nearly twice as expensive in the micro-single era as in the single-lens reflex era. Although the optical quality had improved, there was no particularly huge breakthrough. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Surveillance camera with a lens
The surveillance camera was just a single video capture device. The resolution and resolution of the lens were higher than that of the computer's video head, but it could not catch up with professional digital cameras or DVs. In reality, cameras and lenses were mostly purchased separately. The user can calculate the focal length of the lens according to the size of the target object and the distance between the camera and the object to determine the required lens. The lens required by each user depends on the actual situation. It cannot be assumed that the camera (head) already has a lens and does not need to be equipped with another lens. The focal length of the lens determined the field of view of the camera. For example, a wide-angle lens was suitable for shooting in a large space and could capture more content. A telephoto lens was suitable for long-distance shooting and could see details in the distance. Indoors, they usually chose short focal lenses, such as 2.8mm or 3.6mm lenses, while outdoors, they chose lenses based on distance. Moreover, different focal length lenses had different imaging effects. Long focal length lenses could see more details of distant objects, but the field of view became smaller and the viewing range became narrower. Wide-angle lenses had a wide viewing range, but it might be difficult to distinguish some details. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How to stack the lens of a single-lens reflex camera
The full name of the DSLR was " single-lens reflex viewfinder camera." It only had one mount. In theory, it could only be connected to one lens for optical imaging. Under normal circumstances, the lens could not be stacked. However, there were special uses, such as reversing the lens or connecting the zoom lens. However, these still needed to rely on a pure optical lens to use. On the basis of this lens, you could stack the transfer ring, zoom lens, etc. to achieve different effects. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Does a single-lens single-camera have a lens?
" Standalone " usually meant that it only had the camera body and did not include the lens. Therefore, a single DSLR camera did not have a lens. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The position of the lens and camera in a movie
In a movie, different shots would have different camera positions. The following are some common situations: ** 1. The situation of the camera during the shooting of the two-person conversation ** 1. ** Top corner camera position (No. 1 camera position)** - This was the camera position that determined the relationship between the two of them. It was often called the safety bar or the host position. It could film the entire conversation from beginning to end, mainly used to explain the relationship between the environment and the characters. 2. ** Parallel Cameras (Cameras 2 and 3)** - The camera was parallel to the actors, and the image was taken from the side of the actors. This kind of camera would only capture the side of each person's face. It was not very common in film and television works because actors could only perform with half a face. However, when there was a special expression, such as a special portrait of the character's heart, it would be used. 3. ** Reverse camera position (No.4 and No.5 camera position)** - The camera was on the same side of the axis of the relationship, facing inwards towards the subject, capturing both of them. It was as if the front was the shoulder of one party, and the main body of the picture was the other party. The actors in the front had their backs to the camera, and the actors in the back were the main body of the scene. This kind of over-the-shoulder shot was an objective angle, representing the perspective of the creator and the audience. ** 2. The situation of the external shooting of the front and back of the game ** - The more common way was to shoot from the outside, with the front and back. It was often over-the-shoulder. The camera position was set to the left and right cameras to shoot the characters, and the middle camera was used to explain the position of the characters, the environment, and the rich lens elements. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Rotating camera lens material
In the reference materials, there were some materials about rotating camera lenses, such as "15 pieces of film/media material (4K), magnificent mountain scenery rotating lens shooting, looking up at cliffs, natural scenery, high-definition video, real shot", as well as "classic sci-fi movie lens rotating video template" and "atmospheric three-dimensional film lens combination display template", etc. These could be used as rotating camera lens material. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How to choose a camera lens
When choosing a camera lens, you can consider the following aspects: ** 1. Choose according to the shooting content ** 1. ** Street photography **: 35mm focal length is more suitable. Because the focal length was not too wide, there would be no obvious distortion at the edge of the picture, and more environmental elements could be brought in to tell the story. 2. ** Professional portrait photography **: 85mm focal length is more suitable. The key to taking a portrait was to highlight the subject, and this focal length helped to create a shallow depth of field, thereby separating the subject from the background. 3. ** Landscape photography **: You can choose the "Big Three-Yuan" lens (16 - 35mm, 24 - 70mm, 70 - 200mm focal length, different brands of wide-angle focal length may vary). ** 2. Choose according to your photography level ** 1. ** Newbie or newbie photographer **: If you are a newbie with insufficient financial resources, you can consider a "small three-yuan" lens (the same focal length as the "big three-yuan", a constant zoom lens with an aperture of F4). Its price was affordable, cost-effective, and smaller. However, for lenses with a focal length of 70 - 200mm, photography novices and novices should use them with caution in the early stages of shooting, because this focal length is difficult to control in terms of perspective and spatial sense, and it is easy to affect the basic skills such as the use of the focal length and cognition. However, this focal length also had a unique advantage when shooting busts and photos that focused on compressing the spatial atmosphere (such as oil paintings), and it was closely related to the subject. ** 3. Choose based on budget ** 1. ** Enough budget **: If you have a large budget, you can choose a higher-end lens, such as the "Big Three Yuan" lens (F2.8 constant aperture zoom lens). Its aperture is larger and the image quality is better, but the price of a single lens is often more than ten thousand yuan. 2. ** Limited budget **: You can choose entry-level lenses that are affordable to the public, such as the "Small Three Yuan" lens or some domestic lenses. However, when choosing domestic lenses or sub-factory lenses, you must pay attention to the bayonet fitting problem. ** 4. Choose according to the camera mount ** Cameras of different brands, different types (single-lens reflex or micro-camera), and different frames (APS-C frame or full-frame) had different bayonet systems, such as the Canon full-frame single-lens reflex camera's EF-bayonet, the full-frame micro-camera's RF-bayonet, and so on. When choosing a lens, make sure that the bayonet matches the camera. Even if there is an adapting ring that can be used to adapt different systems of lenses, there may be flaws in the image. Long-term use is not recommended. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Classic shoulder camera lens
The following are some of the classic shoulder camera equipment: - The PXW-X580KC shoulder-mounted video recorder from Sony included a 20x optical zoom lens. It was commonly used for shooting news, meetings, and other scenes. - Sony's PM W-EX330R Broadcast-grade shoulder-carried video recorder (with 16x lens). - The Sony-PXW- Z750 shoulder-mounted video recorder, which was launched at BIRTV2019, was a 2/3-inch flagship product that supported 4K shooting and was equipped with a 3-chip LCD imaging system. Its B4 bayonet lens could be directly installed to maintain high sensitivity and resolution. These devices played an important role in their respective application fields, such as news shooting, live program production (including live broadcast of games, magazine programs, scriptless TV, documentary shooting, etc.), and were the classic shoulder-mounted camera lens related equipment. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is a camera software with a fisheye lens?
The Fisheye app included the Fisheye app, which was a unique mobile camera app. It had a powerful function, version 1.05, and a size of 1.86MB. It had a variety of functions, such as a variety of effects to easily create large-sized photos, a time-lapse function, and a rich material library. When editing photos, it was very convenient to cut, add text, or filter. There were also simulated 170-degree wide-angle fisheye lenses, four professional fisheye lenses, and dozens of LOMO effects. It allows users to experience different shooting fun and take a variety of styles of photos. In addition, when the fisheye camera system was built at the Northern Corona Observatory, Sharpcap software was selected to automatically capture fisheye images. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>