changing lenses

Bright Moon Lenses had obtained a patent for the gradual color-changing film lens and its manufacturing process. This lens includes a base sheet, a color-changing film layer, a stiffening layer, an anti-reflective film layer, and a waterproof film layer. The color-changing film layer is sprayed on the front surface of the base sheet, and the thickness of the color-changing film layer is reduced from the upper edge of the base sheet to the lower edge of the base sheet, and the color-changing film layer and the photo-curing protective layer are contained from the inside to the outside. There were many requirements when choosing the frame to match with the moon. The frame should be a full frame, a single-post head, an S-shaped nose pad, a titanium frame, and a square shape to ensure that it was close enough and that the center of movement was less than 3 mm. The outer angle of the temple should be large enough, and the frame should be stable. The normal range of the eye distance was 10 - 12 mm (the smaller the better), the normal range of the anteversion was 5 - 12 degrees (the larger the gradual film, the better), and the normal range of the face curve was 0 - 8 degrees (the larger it was, the more comfortable it was). The height of the pupil was also very important. The ideal position was that the lower eyelid and the frame height of the mirror were basically overlapped, and the eyes were slightly above the frame height. To determine the pupil height, the examiner and the examinee needed to face each other and be at the same level. It could be determined by observing the reflection points of the eyes through the illumination of the pen lamp. There was also a pupil height sticker to assist in the measurement. When the height of the single pupil was different, under the premise that the frame was adjusted flat, the difference of 2 mm could be based on the average value or the main eye. If the difference was too large, the actual pupil distance of the single eye would be used. When you first wear Bright Moon lenses, you should use them at home first, following the principle of first being quiet before moving, first inside before outside. There may be a slight halo, a sense of swaying, a change in the sense of spatial distance, and other phenomena. When looking at close, there will be slight discomfort when the eyeball is rotated downward. This is a normal phenomenon and generally requires two weeks to adapt. When taking out the mirror, first look far away. When it's clear, put the book in front of your eyes. If you can't see clearly, move the book down and feel the change in clarity in the distance at the same time. When walking, look into the distance, look at the nearest side or lower your head slightly when going down the stairs. When looking close, try to look down and swing your head left and right. In addition, Mingyue Lenses also had a patent related to the multi-axis gradual multifocal lens power measurement system, which helped to solve the shortcomings and deficiencies of the current focimeter measurement.

It was common sense to turn off the power when changing lenses. Generally, when a digital camera was turned on, the camera and lens were connected (communicating). Moreover, the power switch had a reset function, which could not only check the status of the lens and memory card. For a lens with a built-in focusing motor, the contact between the lens and the body bayonet had to transmit information such as focal length and aperture. The body also supplied power to the electronic components in the lens through the contact. If the power was forgotten to turn off and replace the lens, in some cases, the contact would short-circuit, which would burn the electronic components inside the lens, cause lens failure, and even body failure. Therefore, the power should be turned off when changing the lens. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

It was difficult to give an accurate answer to the price of an electric zoom lens. Its price was affected by many factors, such as functional requirements (whether it needed anti-shake, good anti-shock performance, stronger fog penetration ability, etc.), monitoring distance (ultra-long-distance monitoring would require a high price), etc. The price of different types and uses of electric zoom lenses varied greatly. For example, the telephoto electric zoom lens was used for general monitoring distance of about 1 - 20 kilometers. 50,000 - 100,000 yuan was normal, and more than 100,000 yuan was customized for special needs. If it was for ultra-long-distance monitoring, 1,000,000 yuan was normal. There were also some cheaper ones, such as 129.2 yuan, 2000 yuan, 8000 yuan and other electric zoom lenses at different prices, but the functions and application scenarios were different. Therefore, it was impossible to determine the price of the electric zooming video lens based on Guiyang alone. <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>

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.