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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>

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.

The prices of the lenses varied greatly, ranging from 25.8 yuan to 138,000 yuan, including 170 yuan, 99.9 yuan, 160 yuan, 102 yuan, 750 yuan, 115 yuan, 212 yuan, 500 yuan, 80 yuan, 549 yuan, 260 yuan, 149 yuan, 485.49 yuan, 228 yuan, 95 yuan, 108 yuan, 73 yuan, 330 yuan, 50 yuan, 925.55 yuan, 310 yuan, 535 yuan, 196 yuan, 140 yuan, 618 yuan, 111.4 yuan, 295 yuan, 265.78 yuan, 83.3 yuan, 198 yuan, 200 yuan, 380 yuan, 542 yuan, 120 yuan, 165 yuan, 298 yuan, 127 yuan, etc.

No, it wasn't. MR8 was a high-index lens material produced by Mitsui Chem. It was a member of the MR family. It had a high index of refraction, a high Abbe number (better imaging effect), and good processing performance. It was suitable for making frameless and half-rimmed glasses. It was not easy to break and was safer. It had become a new standard for spectacle lens materials and was used by many well-known brands such as Zeiss, Essilor, Kaimi, Mingyue, Xintian Hong, Wanxin, etc. to produce lenses with a 1.61 index of refraction.

Mingyue Lenses has been listed on the Growth Enterprise Market of the SZPE on December 16,2021.