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In general, a machine vision telecentric lens refers to an object space telecentric lens. If the entrance pupil of the lens is located at an infinite position in the image side (all objects behind the objective lens), it can be called an object space telecentric lens. The chief ray originated from optical axis is parallel with optical axis in object side ( or to say have very small angle θ which is called telecentricity in telecentric lens specs), while in image side is not parallel.

Opto lens

Q: What is working distance (WD) and why is it crucial in microscope objectives? ... A: Working distance refers to the distance from the objective's front lens to ...

Most catadioptric telescopes incorporate correctors in their design, so that the aberrations formed by mirrors and lenses are nullified. Catadioptric dialytes, full aperture correctors, and sub-aperture correctors are the different types of catadioptric telescopes.

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Resolution formula is R=0.61*λ/NA. R is object resolution and λ is wavelength, which is usually 0.55um. NA is the numerical aperture of the object side of the lens.

Telecentric Lens has a very low level of distortion, which makes the telecentric lens an excellent choice for metrology applications

Thorlabstelecentriclens

The chief ray originated from optical axis has a angle θ with optical axis. For objects at different WD from the lens, the lens will have either smaller or larger mag.

The DOF of a telecentric lens can be changed by adjusting its aperature. When the aperature gets bigger, the DOF becomes smaller. When the aperature gets smaller, the DOF will increase.

Telecentric Lens system can have a larger depth of field, which is beneficial in maintaining a very good image contrast even when looking at very thick objects

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These F-theta lenses by Avantier are designed for consistent spot size and uniform field curvature correction, ideal for high-resolution imaging applications.

Although object space telecentric lenses can provide much higher measurement accuracy than conventional lenses, bi telecentric lenses can also achieve higher accuracy if the lens is object and image space telecentric. The principle of image space and object space telecentricity also applies in bi telecentric lenses. In a bi-telecentric lens, the entrance and exit pupils project to their respective infinity. The chief ray originated from optical axis is parallel with optical axis in both object side and image side ( or to say have very small angle θ which is called telecentricity in telecentric lens specs).

Resolution is the ability to resolve details in the object. It describes the thinnest line that the human eye can distinguish. Normally, the resolution for machine vision telecentric lens image is as below:

MTF is Contrast of output image/Contrast of input image. Since the input image is always larger than the output image, therefore the MTF value is always from 0-1.

Bi-telecentric lenses are the most accurate type of telecentric lenses because their field of view is completely unaffected by changes caused by changes in object position or sensor position, nor does it operate any cos4θ attenuation. The diagram below shows the comparison of three different lenses: fixed focal length lens,  object space telecentric lens, and double-telecentric lens. The X-axis represents the change in working distance (mm) from the nominal value, and the Y-axis represents the dimensional error percentage from the actual value.

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TelecentricLens cost

High mag from 1.5X to 4X, object telecentric design, coaxial type for option, high resolution with good consistency, suitable for high precision semiconductor & display board inspection

High mag from 1X to 4X, bi-telecentric design, working distance from 65mm to 178mm. Built-in coaxial illumination is available.

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Catadioptric systems may be defined as optical systems that make use of lenses and mirrors for the formation of images. In other words, an optical system is one in which reflection and refraction occurs. Catadioptric systems are a combination of dioptric (lenses) and catoptric (mirrors) systems.

Shanghai Optics provides high-precision off-axis parabolic (OAP) mirrors designed for advanced optical systems, offering superior reflective solutions for applications requiring precise light collimation and focus.

Telecentricscan lens

SWIR-Zoomobjektiv, kompatibel mit 1-Zoll-Kameras SSpezi.

As you can see, the bi -telecentric lens is the most accurate lens in the group, with a working distance offset of 4mm and an error of less than 0.2% during this period. Bi-telecentric lenses should be used in applications that require the highest accuracy and precision.

A true catadioptric system is one that consists of both reflective and refractive elements. A hybrid-catadioptric system, on the other hand, consists of a mirror telescope, along with a refractive field corrector. Catadioptric systems are used in telescopes and photography. Catadioptric systems are characterized by an unusually large field of view.

Telecentriclens

In the optical design, object space telecentricity is achieved by placing the system's iris diaphragm at the intersection of the front-end groups. Since the entrance pupil is at infinity, the field of view is constant and has no field angle. Since the chief ray (which defines the system's field of view) passes through the optical axis at the aperture stop, when the pupil is at infinity, the ray is parallel to the optical axis and the field of view is zero. By contrast, any entrance pupil within a finite distance of the lens results in a non-parallel fiber.

Suitable for line scan cameras such as 16K x 5μm,16K x 3.5μm,12K x 5μm, 8K x 7μm, etc, and area scan camera such as 155 mega pixels, 151 mega pixels

Telecentricillumination

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An object space telecentric lens in which the chief ray is completely parallel to the optical axis in the object space. Note that the field of view does not change no matter where the object plane is, because the chief ray that defines the field of view is perfectly parallel to the optical axis.

The machine vision telecentric lens design is mainly to correct traditional industrial lens parallax. Within a certain range, a telecentric lens for machine vision can make the image magnification of the image does not change. Currently, due to its unique parallel optical path design, the telecentric lens has been widely favored by machine vision applications that are highly required for lens distortion.

Catadioptric telescopes are optical systems that combine specially shaped mirrors and lenses for the formation of images. Telescopes that are made up of such a combination tend to have an aberration-free large field of view, and an improved error correction.

Canrill has mainly two types of telecentric lens for sale: bi telecentric lens and object space telecentric lens. For your selection more quicker, we sorted out different types of telecentric lens. If you have any questions on buying telecentric lens, welcome to inquiry us. We are gladly to offer answers,

For example, XF-MT1X65D, the NA is 0.045, thus the resolution is 0.61*0.55/0.045≈7.45um. ( the resolution in our product list and drawings is 7.33um, is because decimal point numbers )

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Telecentriclens design

Reuven Silverman of Ophir discusses the critical role of M2 measurements in laser technology for optimization and quality control in various industries.

Yes, we can customize lens based on customers’ request. As long as customer provides us with necessary optical requirement, we will be able to customize the lens in a very quick time.

The catadioptric lenses used in cameras are called reflex or mirror lenses. Photographic catadioptric lenses incorporate the cassegrain concept for their design; this reduces the length of the optical assembly by a large extent. These photographic lenses come with some inherent drawbacks, such as inability to use an adjustable diaphragm, and fixed F-number of lenses.

Telecentriczoom lens

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Telecentric Lens can eliminate the parallax error characteristic by having a constant, non-angular field of view. Its magnification and field of view do not change at any distance from the object

Catadioptric systems are devoid of aberrations, because the reflecting and refracting elements cancel out their aberrations. The lens and the mirrors of the system may be placed in the path of the incoming light, thus forming a full-aperture correcting system. When the lens is placed in the cone formed by the mirrors, the catadioptric system becomes a sub-aperture corrector.

Telecentric lenses have two types of telecentricity: object space and image space telecentricity (referring to the entrance and exit pupil positions, respectively). Therefore, telecentric lenses are divided into: object space telecentric lens, image space telecentric lens, and bi telecentric lens.

A Telecentric lens is a kind of lens that the chief rays are parallel to the optical axis. There are three kinds of telecentric lens, that is the object-space telecentric lens, image-space telecentric lens, and the bi-telecentric lens. Telecentric lens is always the core business of Canrill Lens. After continuous research and development for 11 years, Canrill has successfully developed 1700+ kinds of lenses, and the number is still increasing, to meet the diverse and growing applications at the best telecentric lens price.

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