What is a Telecentric Lens? Working, Usage, Type, Finding the right one
Looking for superior lenses in the market to help you capture any object? Let’s find out how it works. Telecentric lenses and UV Camera Lens have limited distortion but have good telecentricity. It has a big aperture and can capture images with depth for high-end applications. Telecentric lenses are high-end lenses and offer great visualization. It is used in machine vision and imaging systems for better performance. It provides high accuracy and repeatable measurements.
A telecentric imaging lens delivers the same size image of an object regardless of distance without losing the quality of the image. This highly demanding feature of the lens makes it highly implemented across many industries such as mining, manufacturing, textiles, electronics, and more.
What is the Objective Of a Telecentric Lens?
The high-featured image provider lenses are designed in a manner that delivers continuous magnification regardless of object location or distance. This makes it highly suitable for many machine vision measurements across many industries. Their primary goal is to capture highly detailed images without missing any details. Industries use machine vision lens to perform automated tasks that need extreme precision. Therefore, a telecentric imaging lens is used to feed accurate images to these machine vision systems.
Types of Telecentric Lens
Different types of lenses are used to achieve various purposes. Sometimes it is used to get wider object angles, other times used for high-resolution zoom-in purposes. But when it comes to getting the same size and high-quality images of a distant object, a telecentric image lens is the one to answer.
To fulfill the various needs, the telecentric lens comes in three variants.
- Object-space telecentric lenses
In object-space telecentric lenses, the image size doesn’t change with the object distance. Depending on the distance of the object from the lens, the image can be blurry, but the size will always be the same. Because of the constant viewing angle and magnification. Object-space telecentric lenses are used in metrology to determine the size and position of new products.
- Image-space telecentric lenses
In an image-space telecentric lens, the image size is the same regardless of the distance between the lens and the sensor. It has an exit pupil, unlike object space, which has an open entrance. Every pixel exhibits the same angle which makes it highly favorable to get implemented in radiometric and color measurement.
- Bi-telecentric or double telecentric
In bi-telecentric lenses, both closed and open entrances are at infinity. Despite both types of lens usage, the magnification measurement is the same for the object. In this, the image size measurement is more precise than the above two, making it more suitable for gaining the right measurement.
At Superior, we work to meet and offer the needs of applications on different platforms. Our team manufactures and offers different kinds of sensor sizes, distortionless designs, large sensors, and high-end resolution lenses and cameras. The telecentric lenses are a combination of optical precision with mechanical stability, and they offer great results.
How Can You Find the Right Telecentric Lens?
Finding the right telecentric lens depends on the intended use and the industry or place. In industry, it can be used as a security camera lens while in some cases it is also being used as a Machine Vision Lens.
So, when you are searching online for a top-quality telecentric lens, you need to focus on some points, which are:
- Field of view: The optical area to see the object.
- Working distance: The distance between an object and a lens.
- Sensor size: It is a tiny but important part of the camera.
- Focal length: The needed distance between the optical center of the camera lens and the image sensor.
- Quality: Make sure to understand the quality of the telecentric lens. High-quality telecentric lenses offer the amazing feature of low distortion. And it is around 0.1% only.
Meanwhile, here are some of the most advanced features of the Machine Vision Telecentric Lens used in three categories.
You can often spot these lenses used for machine vision applications, and they come in three categories as well:
Fixed focal length lenses: It is the most standard form of machine vision applications.
Zoom Lenses: They help magnify any object for clearer vision and viewing.
Macro Lenses: These lenses are most useful for taking close-up images. It has vast applications from personal to business workforces.
Why are Telecentric Lenses and Cameras Ideal for Many Industries?
Telecentric cameras are highly effective and favorable to the industry’s workforce. Like viewing the rotation of a machine from a distance, knowing the wheel speed, or deciding the dimension of a product, all such activities need high clarity. But, thanks to the telecentric lens and its type, they provide the same size, clear, and highly magnified view of the desired parts and place.
Some of the highly broad industries like health, electronics, manufacturing, etc, implement telecentric lenses to get a view of different objects and workforces. Such large usage makes it more popular among other industrial cameras lens.
How Does A Telecentric Imaging Lens Work?
A telecentric lens is an optical lens that helps the operator minimize the angle of events between light rays and the image sensor. It maintains constant magnification regardless of object distance or location, the only condition is that light entering the lens must be parallel to the optical axis. Such super working power of the telecentric imaging lens makes it quite versatile with large advantages.
Here are some of the key advantages of the imaging lenses:
Steady Magnification-
Regardless of the change in the object distance, the image magnification remains unchanged. This makes it highly adaptable in different industries to serve different requirements.
Reduces the parallax error-
The lens has a field of view, which means the images can be magnified without changing the depth of the lens. Generally, the view field is larger giving freedom to the lens to maintain the same image size and quality. This helps in reducing parallax errors.
Reduce distortion-
With the change of the object location or distance, image quality doesn’t decrease. This is a huge plus for the usage of the telecentric lens.
Accurate size measurements-
Telecentric lenses are useful in the manufacturing industries. They help measure the accurate size and shape of any object. It can be heavy and big enough not to be handled easily. Therefore, you need a tripod to keep the camera steady.
Differences between Telecentric Lenses and Ordinary Optics
Both lenses have their work and implementation. When it comes to normal life, the ordinary optics work efficiently. But when it comes to industrial camera lens usage, it’s the telecentric lens that is roleplaying for different complex tasks.
The following table shows the key difference between the two:
| Features |
Ordinary Optics |
Telecentric Lenses |
| Magnification |
Variables |
Constant |
| Distortion |
High |
Low |
| Usage |
Limited |
Large scale |
| Parallax Error |
Present |
Eliminated |
| Rays |
Not Parallel |
Parallel to the optical axis |
From the table, you can see that telecentric lenses are more featureful than ordinary optics. One can choose as per their need and the purpose to serve.
SuperiorCCTV- Single-point Solutions for All Optical Needs
SuperiorCCTV is a one-way solution for getting different kinds of cameras, lenses, and parts for different purposes. Be it personal usage, commercial, or industrial usage, we made all kinds of lenses and cameras. A telecentric imaging lens in one such lens, is highly preferable for business purposes.
Our team of experts is highly qualified and experts in the field to make premium quality lenses and cameras. So, whether you are looking for a CCTV camera lens for your home or a security camera lens for your backyard or farmhouse, we fulfill all.
Also, if you aren’t sure what lens to use then our consultancy team will help with your doubts and questions. This way, you will find the right imaging lens for your requirements.
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