What is a Telecentric Lens? Working, Usage, Type, Finding the right one
Looking for the best lenses on the market to help you capture any object? Let’s find out how it works. C mount telecentric lens 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 excellent visualization. It is used in machine vision and imaging systems for better performance. It provides high-accuracy, repeatable measurements.
A telecentric imaging lens delivers the same-sized image of an object regardless of the object’s distance, without sacrificing image quality. This demanding feature of the lens makes it widely used across industries such as mining, manufacturing, textiles, electronics, and more.
What is the Objective of a Telecentric Lens?
The high-feature image-providing lenses are designed to deliver 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 a single detail. Industries use a C mount telecentric 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.
What are the Types of Telecentric lenses?
Different types of lenses are used to achieve various purposes. Sometimes it is used to get wider object angles. Other times, for high-resolution zoom-in. But when it comes to getting the same size, high-quality images of a distant object, a telecentric lens is the answer. To meet various needs, the C mount telecentric lens is available 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 its size will always remain the same because the viewing angle and magnification are constant. An object-space C mount telecentric lens is 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 remains constant 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, making it highly suitable for radiometric and color measurements.
Bi-telecentric or double telecentric
In bi-telecentric lenses, both closed and open entrances are at infinity. Despite the different lens types, the object’s magnification is the same. In this case, the image size measurement is more precise than the other two, making it better suited for obtaining an accurate measurement.
At Superior, we work to meet and offer the needs of applications on different platforms. Our team manufactures and provides a range of sensor sizes, distortion-free designs, large sensors, and high-resolution lenses and cameras. The telecentric lenses combine optical precision with mechanical stability, delivering excellent results.
How Can You Find the Right Telecentric Lens?
Finding the right C mount telecentric lens depends on the intended use and the industry or place. In industry, it can be used as a security camera lens and, in some cases, as a Machine Vision Lens.
So, when you are searching online for a top-quality C mount 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 essential 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 C-mount telecentric lens. High-quality telecentric lenses offer the fantastic feature of low distortion. And it’s only around 0.1%.
Meanwhile, here are some of the most advanced features of the telecentric lens C mount used across 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 common form of machine vision lens.
- Zoom Lenses: They help magnify objects for clearer viewing.
- Macro Lenses: These lenses are most useful for close-up images. It has wide applications across personal and 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 determining the dimensions of a product, all such activities require high clarity. But thanks to the C-mount telecentric lens and its design, it provides a consistent, precise, and highly magnified view of the desired parts and place.
Some inclusive industries, such as health, electronics, and manufacturing, use telecentric lenses to gain views of diverse objects and workforces. The widespread use of the telecentric lens working distance makes it more popular than other lenses.
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. Thus, the only condition is that light entering the lens must be parallel to the optical axis. The super-working power of the telecentric imaging lens makes it quite versatile, offering significant advantages.
Here are some of the key advantages of the imaging lenses:
1. Steady Magnification
Regardless of the change in the object distance, the image magnification remains unchanged. This makes it highly adaptable across industries, enabling it to meet diverse requirements.
2. Reduces the parallax error
The lens has a field of view, which means images can be magnified without changing the lens’s depth. Generally, the view field is larger, allowing the lens to maintain the exact image size and quality. This helps in reducing parallax errors.
3. Reduce distortion
With changes in the object’s location or distance, image quality doesn’t decrease. This is a significant advantage of the C mount telecentric lens.
4. Accurate size measurements
Telecentric lenses are helpful in the manufacturing industries. They help measure the accurate size and shape of any object. It can be heavy and oversized, making it challenging to handle. Therefore, you need a tripod to keep the camera steady.
Differences Between Telecentric Lenses and Ordinary Optics
Both lenses have their own work and implementation. In everyday life, ordinary optics work efficiently. However, when it comes to industrial camera lens use, it’s the telecentric lens that enables various 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 the C mount telecentric lens is more featureful than ordinary optics. One can choose as per their needs and the purpose for which they are serving.
SuperiorCCTV- Single-point Solutions for All Optical Needs
SuperiorCCTV offers a one-stop solution for a wide range of cameras, lenses, and parts for various purposes. Be it personal, commercial, or industrial use, we make all kinds of lenses and cameras. A telecentric imaging lens is highly preferable for business purposes.
Our team of experts is highly qualified and specializes in crafting premium-quality lenses and cameras. So, whether you are looking for a CCTV camera lens for your home or a telecentric imaging lens for your backyard or farmhouse, we have you covered.
