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The lens was one of the core components of the optical imaging system. It was a key component of optical instruments such as cameras, video cameras, and telescopes. It was composed of lenses, mirrors, filter, and other optical components, which could change the direction of light transmission, focus light, filter light, etc. Its role was to convert the target object into an image through the optical imaging system and pass it to the receiver (such as camera sensor, human eye, etc.) for recording or observation. Cameras were also known as computer cameras, computer eyes, electronic eyes, and so on. They were a type of video input device. Just like human eyes, they could record and store the real environment they saw in the form of data. They had basic functions such as video recording and still image capture. After it collected the image (light signal) through the lens, the image was processed by the sensor circuit and control component in the camera and converted into a digital signal that the computer could recognize. Then, it was input into the computer through a parallel port or USB connection, and the image was restored by software. The main components of the camera are the lens, image sensor, pre-amplifier, ADC (automatic gain control), and A/D. It consists of a synchronous signal generator, a LCD driver, an image signal forming circuit, a D/A conversion circuit, and a power supply circuit. The optical image generated by the lens was projected onto the surface of the image sensor, and then converted into an electrical signal. After A/D (ADC) conversion, it became a digital image signal, which was then sent to the digital signal processing chip for processing. Then, it was transmitted to the computer through the USB interface for processing, and the image could be seen through the display. In the field of camera manufacturing, the airtightness of the lens was a vital indicator. It was directly related to the image quality and service life of the lens. There were technical difficulties in the airtightness test, such as the selection and precision requirements of the airtight instrument, the design of the lens tool and sealing tool, the training of the operator, the operating procedures, and the appearance protection. Different types of cameras had different features and functions. For example, Glory's hand-picked Xiao Pai smart camera Pro was equipped with three high-resolution lenses, supported cable network and dual-band Wifi, had a larger monitoring range, dual-screen monitoring, real-time tracking, 330-degree horizontal and 100-degree vertical adjustment, supported up to 20x hybrid optical zoom, had two types of fill light at night, supported multiple detection modes, and had a two-way voice call function. There was also a dual-lens camera that could rotate 360° without dead angles, and a fixed camera position to achieve remote alarm. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The following are the common parameters of Zeiss lenses: ###1. Focus 1. ** Perspective Relationship ** - The focal length determined the angle of view of the lens. For example, a focal length of 50mm (such as a Zeiss Touit 2.8/50 lens) provides a medium viewing angle. In portrait photography, this focal length was suitable for close-up shots, which could better capture the expression and details of the person. In landscape photography, although it was not the best choice, it could also take a unique photo. - Different focal lengths would produce different images when shooting the same object. A shorter focal length (wide-angle lens) could show a wider scene, while a longer focal length (telephoto lens) could zoom in on distant objects, highlight the subject and compress the sense of space. ###2. Aperture 1. ** Light Control ** - The aperture size (such as the f/2.8 in the Zeiss Touit 2.8/50 lens) directly affected the amount of light entering. A large aperture (with a small numerical value) had an obvious advantage in a low-light environment. It allowed more light to enter the camera, allowing it to take bright and clear photos. - The aperture was also related to the depth of field. A large aperture could create a shallow depth of field effect, blurring the background and thus accentuating the subject, adding an artistic atmosphere to the work. ###3. Optic performance related parameters 1. **MTF (Modulated Transfer Function)** - The MTF chart could reflect the contrast and resolution of the lens. By looking at the MTF chart, you can roughly understand whether the lens is a high-contrast lens or a high-resolution lens, which helps to evaluate the image quality of the lens before buying it. 2. ** Film coating technology ** - For example, the advanced coating technology used by the Zeiss Touit series lens was used to effectively reduce reflection and glare, ensuring the clarity and color reproduction of the picture. A good coating could improve the light transmission rate, reduce the loss of the image caused by light reflection, make the color of the photo more realistic and bright, and reduce the bad phenomena such as facula in the picture. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

There were C ports, CS ports, F ports, M72 ports, M95 ports, and so on. In addition, different camera manufacturers also had their own lens mounts, such as Canon's " EP," Nikon's " F," Pentax's " K," Sonny's " E," Pantheon's " LUMIX," Fuji's " X," and so on. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

There were many aspects to the theory of the camera lens: 1. ** Focus ** - Different focal lengths were suitable for different scenes and subjects. The focal length of a standard zoom lens generally starts from 24mm or 28mm, covering 70mm to 120mm, such as 24 - 105mm, 24 - 70mm, 28 - 70mm, etc. It has a wide range of shooting areas, suitable for portraits, scenery, humanities, cities and many other subjects. It is a common lens type for beginners, and it is also one of the most commonly used lens types for experienced photographers. - The focal length of the telephoto zoom lens was above 200mm, such as 70 - 200mm f/2.8, 70 - 200mm f/4, suitable for shooting portraits, flowers, plants, and street humanities. If you want to shoot birds, lotuses, and long-distance scenery, you may need a lens with a focal length of more than 300mm, such as 70 - 300, 100 - 400, etc. The advantage of a telephoto lens was that it could shoot without disturbing the subject, and it could bring a good blurring effect. - Fixed focus lenses had fixed focal lengths, such as 28mm, 35mm, 50mm, 85mm, etc. They had good image quality and a large aperture. They were relatively friendly to portrait subjects, but they could not be zoomed. There were certain requirements for the photographer's operation level. 2. ** Aperture ** - The aperture size of the lens affected the amount of light entering and the blurring effect. For example, Canon's EF24 - 105mm 1: 4L IS II USM lens had a maximum aperture of F4 and was constant, while Nikon's NikKOR 70 - 200mm 1: 2.8G II ED lens had a maximum aperture of F2.8. The maximum aperture of a non-constant aperture lens would change according to the focal length. For example, 18 - 135mm 1:3.5 - 5.6, the maximum aperture at 18mm at the wide-angle end was F3.5, and the maximum aperture at 135mm at the telephoto end was F5.6. 3. ** Regarding the lens mount ** - Different brands of cameras had different lens mount types. Canon's EF-mount was used for full-frame and APS-C format cameras, while the EF-S mount could only be used for APS-C format cameras. There was also the TS-E shift-axis lens mount. Nikon had AF-S lenses that supported ultrasonic motor autofocus, and its DV represented the name of a non-full-frame digital single-lens reflex camera, while its Felix represented the name of a full-frame digital single-lens reflex camera format. 4. ** Special Function ** - Some lenses supported anti-shake function. The "IS" in Canon's lenses indicated that it supported image stabilization, while the "VR" in Nikon's lenses indicated anti-shake. - There were also some lenses that used special lenses to improve the image quality. For example, the Nikon 70 - 200mm f/2.8E FO LED VR lens used ultra-low dispersion lenses (ED), which had excellent image reproduction capabilities. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Here is some information about lenses for Canon and Soni cameras: - Canon would launch a new macro lens in the first half of 2025, with a focal length of more than 100mm. The price was expected to be higher than the existing Canon RF100mm F2.8L MCROIS USM lens. - Canon RF70 - 200mm f/2.8L IS USM medium telephoto lens (Canon RF-mount). - A few hundred yuan Canon ESF50F1.8 fixed-focus lens was suitable for beginners. - SonyFE24 - 70mm f/2.8GM II (SEL2470GM2) standard lens (FE-mount). - Multiple sources have confirmed that by the end of November, the company will release the 24 - 70mm F2.0 GM lens, as well as upgraded models of the A1 and A7M4. - For beginners, the 50F1.8 lens of the Soni e-port was suitable for shooting with the ZVE10 second-generation lens. The large aperture was easy to shoot and light. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

The price list of Essilor lenses for 2024 is as follows: - [Membrane cleaning series: Price range from 780 to 3600 yuan.] Among them, the 1.56 index of refraction is about 780 - 799 yuan; the 1.591 index of refraction is about 980 - 999 yuan; the 1.67 index of refraction is about 1780 - 1799 yuan; the 1.74 index of refraction is about 3680 - 3699 yuan (the price of the high index version is higher). This series provides clear and transparent vision and effective anti-blue light function, suitable for users who use electronic products for a long time. - A4 series: The price range is from 980 yuan to 2380 yuan. - "Diamond Crystal·Membrane Rock Series: The price range is from 1080 yuan to 4300 yuan. This series of lenses has super wear-resistant, dust-resistant, waterproof and oleophobic properties. - [Diamond Crystal·Membrane Defense Series: Price range from 1180 to 2780 yuan.] - [Diamond Crystal Film Series: Price range from 1480 to 3180 yuan.] It should be noted that the price of Essilor lenses in 2024 varies according to the series, function, and refraction index. The actual price may vary due to factors such as region, promotional activities, lens material, power, and additional functions. In addition, as one of Essilor's main series, the original price of the 1.56 index A4 lens was 999 yuan, and the original price of the 1.56 index film cleaning lens was 780 yuan. Moreover, if the degree of the Star Control lens deepened by more than 50 degrees within half a year, the new lens could be replaced for free.

Mingyue MR - 8 lenses have the following characteristics: - [Material properties: It is a type of pu material.] The Abbe number was 40, which was lower than some lenses with lower Abbe numbers. Its specific gravity was 1.30, and its wear resistance was even higher. - ** In terms of visual effects **: If it is a 60MR 8 lens, it is designed as an aspheric surface and can provide a common visual effect for daily use. The field of vision is relatively better. - ** Range of Degree **: It is suitable for people with 0 - 800 degrees of nearsightedness and 50 - 200 degrees of refraction. - ** In terms of product advantages **, the lenses are made of the Mitsui MR series imported from Japan. Compared with traditional lenses, they are ultra-thin, high-definition, and more durable. Mingyue's PM ultra-bright series has better light transmission, good quality control, and excellent anti-counterfeit level. The film layer and the base material are double anti-blue light, which can meet the needs of most people with limited budget. - ** Points to note **: Brightmoon 1.74 lenses are not produced by Brightmoon itself but are purchased from other sources. If you need 1.74 lenses, please pay attention. Some anti-blue light products such as anti-blue light pro have a yellow background color and are only suitable for e-sports enthusiasts. In addition, when buying the Bright Moon lenses, you need to pay attention to distinguish the authenticity.(The edge of the lenses purchased in regular stores has a fog anti-counterfeit code composed of three letters and two digits, of which the letter C is larger), official website inquiry (after finding the anti-counterfeit code, click the anti-counterfeit inquiry option on the official website of Mingyue Glasses to enter the identification), and look at the light transmission and optical equality (put the lens 30 cm in front of you to look into the distance, the image is clear without distortion, and if the moving lens has no image jump, it is authentic) and other methods to identify.

The price of Bright Moon lenses varied according to the type of lens, function, and refraction index: - [Basic single-vision lenses: Non-blue-light-resistant resin lenses start at around $200; blue-light-resistant single-vision lenses start at around $300.] - Special Function Lenses: - [Anti-blue light lenses: Using a new filter technology, the price ranges from 300 to 800.] - Color Changing Lenses: Fast response speed, natural color conversion, price range: 500 - 1200. - [Anti-fatigue lenses: designed for long-term close-range workers. The price starts from 400 RMB. The high-end version with intelligent adjustment can reach 1500 RMB.] - Middle-aged and elderly lenses: The gradual multifocal lenses meet the reading and farsightedness needs of middle-aged and elderly people. The price starts from $500, and the high-end version does not exceed $2000. - Children's lenses: For children's visual development, the price starts from 300 RMB, and the customized ones for different ages can reach 1000 RMB. - presbyopic glasses series: designed for middle-aged and elderly people. The price starts from 500 yuan for the basic style and 1500 yuan for the high-precision customized model.] - Model price example (for reference only): - 1.56 aspheric surface: about 328 yuan per set. - 1.60 aspheric surface: about 498 yuan per set. - 1.71 aspheric surface: Depending on the specific configuration, the price ranged from $1168 to $1268. - Anti-blue light series: 1.60 anti-blue light lenses, about 648 RMB per pair; 1.71 anti-blue light lenses, about 1498 RMB per pair.