Commonly, these lenses are made from photosensitive polymers and glass optical components, with the polymer applied to one surface of the bonded lens pair. This method not only enables the lenses to be manufactured quickly within a short timeframe but also offers flexibility similar to traditional multi-element assemblies. However, the working temperature range of Aspheric Achromatic Lenses is quite narrow, restricted from -20°C to +80°C, and they are not suitable for Deep Ultraviolet (DUV) spectral transmission.

focallength中文

Creation of Positive Achromatic Lenses involves the precise bonding of two selected materials, commonly N-BK7 and SF5 glass. The lens design parameters including radius of curvature, center thickness, and others are meticulously calculated to ensure optimal optical performance.

Negative achromatic lenses have a wide range of applications in optics, such as laser beam expanders, optical relay systems, and more. They offer a stable diverging angle across a wide wavelength and can produce a smaller and clearer spot and image compared to single lenses.

Aspheric Achromatic Lenses merge the advantages of both aspheric and achromatic lenses, creating a sophisticated optical component. This unique combination allows them to deliver exceptional image quality and precise chromatic aberration correction.

As ultra-telephoto zoom lenses allow you to enlarge the faraway subjects, they are best suited for shooting subjects you cannot get close to, such as wildlife, sporting events held at large venues, aircraft and trains. By combining the compression effects and bokeh that telephoto zooms are known for, you can also compose more appealing images.

Focal lengthcamera

The 17-70mm F/2.8 Di III-A VC RXD (Model B070) is a large-aperture standard zoom lens for APS-C format mirrorless cameras. With a focal length range of 17mm to 70mm (a full-frame equivalent of 25.5-105mm) for daily use, this achieves a 4.1x zoom. The optical design ensures high resolution and high contrast not just in the center of the image but also in corners and at the edges. The quiet AF drive motor and the VC image stabilization mechanism facilitate hand-held shooting. In addition, by counteracting focus breathing, the 17-70mm F2.8 empowers users' expression of their creative intentions to the fullest degree. This highly practical lens allows you to easily enjoy the high image quality of a large F2.8 aperture for both still and video shooting.

Generally, on a camera lens there is an indication of focal length. For a product name such as “28-75mm F/2.8, ” this “xx mm” indicates the focal length. There are two types of lenses: prime lenses which have a single focal length, and zoom lenses that have a variable focal length. If the focal length is described with a range, such as “xx-xx mm,” it is a zoom lens. For a prime lens, only a single figure is indicated, such as “xx mm.” Example of a zoom lens: 28-75mm F/2.8 Di III VXD G2 (Model A063)Example of a prime lens: 20mm F/2.8 Di III OSD M1:2 (Model F050)

Achromatic lenses effectively reduce or eliminate chromatic aberration by combining glass materials with different refractive indices and dispersion properties. These lenses are mainly divided into two types: cemented and air-spaced. Below is a further comparison of these two types of lenses:

Looking for a cost-effective achromatic lens manufacturer? Consider Chineselens Optics – a leading optical company based in China. We specialize in manufacturing achromatic lenses for a wide range of applications including: camera lenses, telescopes, and microscopes. Chineselens Optics has built a reputation in the industry for affordable pricing and superior product quality.Whether it’s for your scientific research project, photographic hobby, instrumentation, or any situation where precise imaging is required, our achromatic lenses will provide you with excellent color correction and image clarity. Choose Chineselens Optics for quality optical solutions and services that will help your projects and products reach new heights. Contact our experts today for a consultation!

Wide-angle zoom lenses cover the range from ultra wide-angle to standard range. Ultra wide-angle lenses allow you to get closer to buildings and vehicles and still capture a wide range of subjects, resulting in more dynamic shots. It also allows for unique portrait and pet photography, making the most of the perspective. Lightweight and compact TAMRON lenses are particularly useful when shooting landscapes, as the time and distance spent carrying them around can be long.

The production of Achromatic Triplet Lenses involves the precise bonding of lenses made from different types of materials. Typical lens materials include traditional optical glass, ultraviolet-grade fused silica (JGS1), infrared-grade fused silica (JGS3), and calcium fluoride (CaF2), among others. Key lens parameters, such as the radius of curvature, central and edge thickness, are meticulously designed to ensure optimal optical performance.

These lenses are widely used in fluorescence microscopy, image relaying, detection, and spectroscopy, among others. They provide almost constant focal lengths across a broad wavelength range, and compared to single lenses, they produce smaller light spots and clearer imaging.

These lenses are typically composed by bonding together two lenses: one achromatic lens and one aspheric lens. The design of the aspheric lens is aimed at mitigating the wavefront errors produced by traditional spherical lenses, thereby achieving more accurate image quality, reducing the RMS spot size, and approaching the diffraction limit.

Achromatic Triplet Lenses represent an advanced optical technology specifically designed for the effective correction of chromatic aberrations and other types of optical anomalies. These lenses are composed of three distinct lens elements, typically two elements made of high refractive index materials encasing one made of a lower refractive index material. This arrangement not only significantly reduces aberrations, including distortion and spherical aberrations, but also provides clear, high-quality imaging results.

70-180mm F/2.8 Di III VC VXD G2 (Model A065) has evolved to G2 level.This is the world’s smallest and lightest, fast-aperture telephoto zoom lens for Sony E-mount with astounding portability and superb image quality.

Another characteristic of focal length is depth of field. Depth of field refers to the range in which the image looks it is in focus, and a deep depth of field means that the image looks in focus through wide range, such as from a subject to background. And if the depth of field is shallow, only the area around the subject will be in focus and the background will have a smooth bokeh. The shorter the focal length of the lens and the larger the aperture (F-number), the deeper the depth of field. This is why wide-angle lenses are suitable for landscape photography, as the short focal length increases the depth of field and allows the photographer to capture details in the background clearly. On the other hand, as telephoto lenses have a long focal length and shallow depth of field, the bokeh in the background of a subject is more pronounced. By utilizing these bokeh effects, you can capture portraits and other images where the subject stands out against the background.

Put your optical component needs in the hands of Chineselens Optics and our dedicated marketing team will quickly provide you with a customised response and solution.

As explained above, focal length is a very important figure, but when choosing a lens you also need to be mindful of the sensor size on your camera body. With digital SLR cameras, light reaching the image sensor is stored as an electrical charge, and an image is created based on the color information obtained through the color filter. These image sensors come in mainly two types: 35mm full-frame, and APS-C. The size of a 35mm full-frame sensor is 36mm x 24mm. The larger the sensor size allows a wider area to be captured with greater sensitivity and its rich gradation. On the other hand, the size of an APS-C sensor is a step smaller at 23.5mm x 15.6mm* and captures narrower area. *APS-C image sensor sizes vary by camera. Therefore, you will need a lens that is compatible with the sensor size of the camera body. Camera lenses have a specific sensor size that they are compatible with, so choose a lens that is compatible with the camera you have. When APS-C camera is used, you will need to do some calculation to figure out the real coverage. The angle of view of each focal length depends on the sensor size. Generally, focal lengths and angles of view are based on 35mm full-frame size, so when selecting an APS-C compatible lens, it is easier to understand the angle of view when converted to full-frame size. Such conversion is known as '35mm equivalent'. In general, the focal length of APS-C lenses can be converted to the focal length of lenses for full-frame cameras by multiplying the focal length by 1.5 (for Sony, Nikon and 1.6 for Canon). The relationship between angle of view and focal length can be mapped as shown in the table below, which you can use as a reference when selecting a lens for APS-C.

Here are TAMRON's recommended lenses by lens type. TAMRON zoom lenses cover a wide range of focal lengths with a single lens yet are of a size that makes them easy to carry. On top of this, they are characterized by their high descriptive performance and close-up shooting ability. We hope you will find the lens that suits you best.

A Positive Achromatic Lens is usually a doublet, made up of a positive low-refractive index element (such as crown glass) and a negative high-refractive index element (such as flint glass). This combination allows the chromatic aberration of one lens to be neutralized by the other, achieving the correction of chromatic aberration.

An achromatic lens is a type of optical lens designed to limit the effects of chromatic and spherical aberration. Chromatic aberration occurs when different wavelengths of light are refracted by different amounts, causing a failure to focus all colors to the same convergence point. This results in a blurred image with color fringes around the edges. Achromatic lenses are engineered to bring two wavelengths, typically red and blue, into focus in the same plane, thereby significantly reducing chromatic aberration.

With their ingenious design and efficient manufacturing process, Aspheric Achromatic Lenses demonstrate outstanding optical performance and a broad spectrum of applications, making them an indispensable key component in modern precision optics and vision systems.

The 17-50mm F/4 Di III VXD (Model A068)It's the world’s first lens covering from ultra wide-angle 17mm to the standard 50mm focal length. The highly-compact TAMRON 17-50mm F/4 Di III VXD (model a068) for Sony E-mount full-frame mirrorless cameras offers maximum versatility for still and video creators. From landscapes to living rooms, this lens captures all that you see.

Cemented achromatic lenses and air-spaced achromatic lenses each have their unique advantages and disadvantages. Cemented lenses are suitable for applications requiring compact design and high light transmission efficiency, while air-spaced lenses show their advantages in high-power laser use or scenarios requiring more precise aberration correction. Considering specific application needs and cost-performance ratio can help determine which type of lens to choose.

The 35-150mm F/2-2.8 Di III VXD (Model A058) is a high resolution travel zoom lens that covers everything from the 35mm wide angle to the 150mm telephoto focal length, the first zoom lens achieving an aperture of F2 at the wide angle end. It has a groundbreaking fast-aperture and utilizes the linear motor focus mechanism VXD (Voice-coil eXtreme-torque Drive), thereby achieving high speed, high precision autofocusing. The innovative lens design enabled us to greatly improve the lens's grip and functionality. The software, developed in-house, enables to easily customize functions and to update firmware.

Telephoto zoom lenses enable photographers bring the subject closer, making them ideal for events such as sports events, as well as for birding and wildlife. They are also useful in natural landscapes photographed in conjunction with trekking, hiking and mountaineering.They are also recommended for impressive portrait photography with naturally blurred backgrounds and compression effects.

Achromatic Triplet Lenses usually feature a symmetrical three-element design, consisting of two high refractive index glasses (such as crown glass) and one low refractive index glass (like flint glass) bonded together through a precise adhesion process. This structural layout enables the lens to efficiently correct chromatic aberration and further reduce aberrations, such as pincushion distortion and spherical aberration, through its symmetry.

The negative achromatic lens consists of a positive-dispersion crown glass lens paired with a negative-dispersion flint glass lens. The design aims to counteract the chromatic aberration produced by one lens with that produced by another, thus effectively correcting chromatic aberration. These lenses play a crucial role in various optical systems requiring light to diverge.

When light enters a lens, the point where the light gathers is called the focal point. While light travels in a straight ray, when it passes through a lens it refracts and is concentrated at a single point so called focal point. When a light passes through a lens and at this focal point it forms an image, when an image sensor is placed at this position, the image can be captured. A focal length is a distance from the center of the lens (principal point) to the image sensor, and this is an important value that characterizes a lens.

Here is some basic knowledge about focal length with interchangeable lenses that you will need to know when shooting with an SLR or mirrorless SLR camera. When shooting with an interchangeable lens camera, you can take beautiful and impressive photos by working with the angle of view, focus point and degree of bokeh. Particularly when choosing a lens, it is important to understand the characteristics of focal length as the angle of view changes depending on focal length. Let’s learn the basic knowledge and make use of it to take the photos as you imagine.

The 20-40mm F/2.8 Di III VXD (Model A062) is a new large-aperture standard zoom lens that thoroughly pursues portability. While covering the range from the ultra-wide angle of 20mm to the standard range of 40mm, it is the smallest and lightest in its class. It also offers high image quality throughout the entire zoom range, making it useful not only for still image shooting but also for video recording such as vlogging. The VXD, which is quiet and agile, achieves high-speed, high-precision autofocusing. It is a new, unprecedented large-aperture standard zoom lens that allows users to easily enjoy taking out and shooting both still and video.

The focal length of a lens is defined as the distance from the center of the lens (principal point) to the image sensor of the camera. Focal length is an important figure that determines the angle of view. A lens with a short focal length is a wide-angle lens, a lens with a long focal length is a telephoto lens and a standard lens is somewhere in between. When choosing a lens, pay attention to the focal length and select a lens that suits the subject or scene you want to photograph.

The 50-400mm F/4.5-6.3 Di III VC VXD (Model A067) is an ultra-telephoto zoom lens with an 8x zoom starting at 50mm at the wide-angle end and compatible with full-frame mirrorless cameras. The lens delivers uncompromised high image quality over the entire 50-400mm focal length range, yet is as compact and lightweight as a 100-400mm class lens. Equipped with the VXD mechanism and the VC mechanism, the lens can quickly focus on the subject's movement when shooting sports and wild birds. The 50-400mm F4.5-6.3 is a new ultra-telephoto zoom lens that combines unparalleled image quality and mobility.

Product Page | 11-20mm F/2.8 Di III-A RXD (Model B060) is the world's first compact, lightweight F2.8 ultra wide-angle zoom lens for Sony E-mount APS-C mirrorless cameras. Can be a great choice for video shooting.

11-20mm F/2.8 Di III-A RXD (Model B060) is the world's first compact, lightweight F2.8 ultra wide-angle zoom lens for Sony E-mount APS-C mirrorless cameras. Can be a great choice for video shooting.

The 150-500mm F/5-6.7 Di III VC VXD (Model A057) is compact enough to be handheld while maintaining a focal length of 500mm on the telephoto end. It allows users to easily enjoy the world of the 500mm ultra-telephoto lens while maintaining its high image quality. The high-speed, high-precision AF with excellent tracking performance and the VC mechanism support handheld shooting in the ultra-telephoto range.

A standard zoom lens covers wide-angle to telephoto focal lengths around 50mm. In addition to snap shots and portraits, these lenses prove their worth in a wide variety of shooting scenarios such as landscapes at the wide end and shots of animals and buildings at the telephoto end.

In production, negative achromatic lenses usually employ materials like N-BK7 and SF5. Lens manufacturing involves meticulous design of many parameters, such as the radius of curvature, center thickness, and edge thickness, to ensure optimal optical performance.

Achromatic Triplet Lenses play a crucial role in modern optical systems, especially in applications requiring high-precision imaging and chromatic aberration correction. Their high-quality design and manufacturing make them the preferred choice for many advanced optical applications.

The important point about focal length is that the angle of view changes with its actual number. The angle of view is the angle of area captured by the camera through the lens, and the larger the angel of view, the wider the area is captured. Lens types can be roughly divided into three categories: wide-angle, standard, and telephoto. A standard lens can capture images at an angle of view close to that of the human field of view. Generally, lenses with a wider angle of view are called wide-angle lenses, and lenses with a narrower angle of view are called telephoto lenses. As a general rule of thumb for focal lengths, focal length smaller than 35mm are generally classified into wide-angle lens, lenses around 50mm are called standard lens, and lenses larger than 80mm are telephoto lens. Check out the differences in impression and composition caused by changing the angle of view. Here is an example of a portrait taken with the TAMRON 35-150mm F/2-2.8 Di III VXD (Model A058) at a different focal length. At the wide-angle end (35 mm), the beautiful impression of the figure standing stands out with the background. At the telephoto end (150 mm), on the other hand, the expression on the person's face is compelling and the background bokeh accentuates this image. In this way, by changing the focal length of a zoom lens, various angles of view can be created, and different impressions can be captured.

With their excellent imaging properties, Achromatic Triplet Lenses are extensively used in fields that demand high-quality imaging. These include fluorescence microscopy, spectroscopy, surface inspection, and life sciences imaging, among others. The lenses are capable of providing excellent color correction and high-resolution image quality across a wide wavelength range.

The 17-28mm F/2.8 Di III RXD (Model A046) achieves a filter diameter of ø67mm, which is surprising for a large aperture ultra wide-angle zoom lens for full-frame cameras. It’s small and light weight with a good camera balance. It's a dedicated lens for mirrorless interchangeable -lens cameras that can be carried easily and can be used in various situations.

Focal length

In the procurement process, considering factors such as material quality, manufacturing precision, lens size and focal length, optical coatings, customization requirements, and bulk purchasing is key to selecting achromatic lenses that meet specific application needs and budget.

The outstanding performance of achromatic lenses in reducing chromatic and other aberrations has greatly advanced modern optical technology. The wide range of application areas demonstrates the significant contribution of achromatic lenses to enhancing the performance and imaging quality of various optical systems.

Achromatic lenses are critical optical components designed to reduce chromatic aberration, making them widely used in microscopes, telescopes, and other optical instruments. Below are the top ten globally recognized suppliers in the field of achromatic lens manufacturing:

28-75mm F/2.8 Di III VXD G2 (Model A063) is the second-generation fast-aperture standard zoom lens for Sony and Nikon full-frame mirrorless cameras, offering significantly improved optical and autofocus performance and new function customization.

Overall, negative achromatic lenses play a vital role in optical systems that require high precision diversion of light and correction of chromatic aberrations.

Focus distance

These two or more elements are cemented together to form a doublet lens. The combination of these materials helps to counteract the dispersion of light, effectively minimizing chromatic aberration.

Negative Achromatic Lenses are specially designed optical lenses for correcting chromatic aberrations, typically made by bonding two different types of glass materials—a low refractive index crown glass and a high refractive index flint glass. Unlike their counterpart, the Positive Achromatic Lenses, negative achromatic lenses primarily function to disperse, not focus, light rays.

Chromatic aberration occurs because different wavelengths (colors) of light refract, or bend, by different amounts when passing through a lens. This causes each color to focus at different points along the optical axis, resulting in a blurred image with color fringes.

When selecting achromatic lenses, it is crucial to focus on the following performance indicators to ensure the lens meets the specific application requirements:

Achromatic lenses play a crucial role in numerous fields due to their excellent chromatic aberration correction capabilities, significantly enhancing the imaging quality and overall performance of optical systems. The main application areas include:

The 35-150mm F/2-2.8 Di III VXD (Model A058) is a high resolution travel zoom lens that covers everything from the 35mm wide angle to the 150mm telephoto focal length, the first zoom lens achieving an aperture of F2 at the wide angle end. It has a groundbreaking fast-aperture and utilizes the linear motor focus mechanism VXD (Voice-coil eXtreme-torque Drive), thereby achieving high speed, high precision autofocusing. The innovative lens design enabled us to greatly improve the lens's grip and functionality. The software, developed in-house, enables to easily customize functions and to update firmware.

The 50-400mm F/4.5-6.3 Di III VC VXD (Model A067) is an ultra-telephoto zoom lens with an 8x zoom starting at 50mm at the wide-angle end and compatible with full-frame mirrorless cameras. The lens delivers uncompromised high image quality over the entire 50-400mm focal length range, yet is as compact and lightweight as a 100-400mm class lens. Equipped with the VXD mechanism and the VC mechanism, the lens can quickly focus on the subject's movement when shooting sports and wild birds. The 50-400mm F4.5-6.3 VC is a new ultra-telephoto zoom lens that combines unparalleled image quality and mobility.

The 35-150mm F/2-2.8 Di III VXD (Model A058) is a high resolution travel zoom lens that covers everything from the 35mm wide angle to the 150mm telephoto focal length, the first zoom lens achieving an aperture of F2 at the wide angle end. It has a groundbreaking fast-aperture and utilizes the linear motor focus mechanism VXD (Voice-coil eXtreme-torque Drive), thereby achieving high speed, high precision autofocusing. The innovative lens design enabled us to greatly improve the lens's grip and functionality. The software, developed in-house, enables to easily customize functions and to update firmware.

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In addition to the focal length, the F-number (aperture value) is another important figure that expresses the characteristics of the lens: the smaller the F-number, the more light-gathering power it will have, and will broaden your possibility. The F-number is calculated as 'focal length ÷ lens effective diameter'. The smaller the 'maximum aperture F value' when the aperture is at its widest, the more sensitive the lens is. When choosing a lens, it is better to mind the F-number as well as the focal length.

The 17-70mm F/2.8 Di III-A VC RXD (Model B070) is a large-aperture standard zoom lens for APS-C format mirrorless cameras. With a focal length range of 17mm to 70mm (a full-frame equivalent of 25.5-105mm) for daily use, this achieves a 4.1x zoom. The optical design ensures high resolution and high contrast not just in the center of the image but also in corners and at the edges. The quiet AF drive motor and the VC image stabilization mechanism facilitate hand-held shooting. In addition, by counteracting focus breathing, the 17-70mm F2.8 empowers users' expression of their creative intentions to the fullest degree. This highly practical lens allows you to easily enjoy the high image quality of a large F2.8 aperture for both still and video shooting.

With precision imaging capabilities and chromatic aberration correction, Positive Achromatic Lenses are indispensable components in advanced optical systems, particularly in applications where image quality is of paramount importance.

These top suppliers leverage their extensive technology and experience in optical component manufacturing to provide high-quality achromatic lenses that meet the demands of various applications.

The 70-300mm F/4.5-6.3 Di III RXD (Model A047) for full-frame mirrorless cameras is a telephoto zoom lens designed and created so photographers of all skill levels can enjoy high quality images comfortably. The 70-300mm F4.5-6.3 covers a broad telephoto zoom range yet is the small and lightest weight. With special emphasis on resolving power, TAMRON has deployed special lens elements appropriately arranged to correct chromatic aberration, generally very strong in a telephoto lens, as well as other aberrations. Users can enjoy high-resolution images combined with stunning bokeh qualities that are achievable only with a telephoto lens. The lens also incorporates the RXD, a high-speed precision AF drive system that is remarkably quiet. The 70-300mm F4.5-6.3 is a versatile lens for photographing landscapes, sports and other action, pets, wildlife, and more. The lens also demonstrates its potential for portrait shooting, casual snapshots, and scenarios that require you to be mobile and shoot handheld, like sporting events.

When it comes to bulk purchasing and customizing achromatic lenses, the price is primarily determined by the following factors: