Parallax is a type of optical error that occurs when the position of an object about other objects in a scene changes, causing them to appear out-of-focus. The biggest function of the telecentric lens is to solve the parallax problem.
How does a telecentric lens work?
A Telecentric Lens is a lens that has been designed to correct for the distortion caused by perspective. Telecentric lenses are lenses that use a central point to determine the focal length. This method is more accurate because it does not rely on the distortion of objects at the edge of the image. The images from a telecentric lens look more natural because they do not distort the perspective.
What benefits they offers?
1) Nearly zero distortion
The distortion factor is the percentage difference between the actual size and the image size of the image sensor. Ordinary machine lenses usually have distortion higher than 1~2%, which may seriously affect the accuracy of measurement. In contrast, the telecentric lens has passed strict manufacturing and quality inspection, and this error is strictly controlled below 0.1%.
2) No perspective error
Many mechanical parts cannot be placed precisely, and the measurement time interval is constantly changing. Telecentric lenses can help to accurately reflect real images.
3) Telecentric design and ultra-wide depth of field
A bi-telecentric lens can not only enhance the natural depth of field with aperture and magnification but also has an unparalleled optical effect of a non-telecentric lens: the image remains unchanged when moving objects within a certain object distance range, that is, the magnification remains unchanged.
A good telecentric lens can help the industry achieve greater success, speed up efficiency, reduce waste, etc. If you are considering applying it in your own business, you can check out SmartMoreInside‘s website to learn more.
In this article, we will be discussing the parallax correction method – a telecentric lens. Telecentric lenses are designed to correct for the displacement of objects on the image plane caused by a change in magnification or viewing direction. By understanding how this correction process works, you can prevent unwanted distortion from occurring in your images and achieve better clarity across all focal lengths.