Differences between telecentric and conventional lenses

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2024/10/10

author:adminBOSS

Features and advantages of telecentric lenses:

 

1. Constant Magnification: Telecentric lenses are able to keep the magnification of the image constant over a certain range of object distances, which is especially important for cases where the measured objects are not on the same object plane. This feature ensures that regardless of the distance of the object from the lens, the image size is almost the same, effectively avoiding parallax problems.

 

2. Low distortion: telecentric lenses through sophisticated optical design, the distortion will be controlled at a very low level (usually less than 0.1%), far better than ordinary lenses, can more realistically restore the image details.

 

3. High depth of field: telecentric lenses have a high depth of field range, able to maintain image clarity over a wide range of object distance variations, which is very favorable for application scenarios that require large depth of field imaging.

 

4. High resolution: In order to meet the high requirements of machine vision system on image quality, telecentric lenses usually have high resolution characteristics, which can capture more details and improve the accuracy of image analysis.

 

 

Characteristics of conventional lenses for machine vision:

 

1. Fixed focal length: The focal length of a conventional lens usually does not change with the object distance, but the magnification of the image changes with the object distance.

 

2. Perspective distortion: Since the optical axis is not parallel to the plane of the object, conventional lenses produce perspective distortion during the imaging process, i.e., the farther the object is from the lens, the smaller its size in the image.

 

3. Larger distortion: Compared with telecentric lenses, the distortion of conventional lenses is usually larger (may be higher than 1~2%), which affects the accuracy of imaging to some extent.

 

4. Lower cost: Traditional lenses have a relatively simple structure and lower manufacturing cost, so they are widely used in some application scenarios that do not require high imaging quality.

 

5. Wide range of applications: Traditional lenses are suitable for a variety of scenarios, such as daily shooting, people photography, architectural photography, etc., but they are out of their reach in areas requiring high-precision measurements.

 

 

Telecentric lenses are widely used in high-precision industrial inspection, machine vision and scientific research with their superior performance of high precision, low distortion and high resolution; while conventional lenses are more suitable for daily shooting, photography and consumer electronics.

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