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Optical lens
Bi-telecentric lens with 208 mm diameter front element and a C-mount camera interface
A telecentric lens is a special optical lens (often an objective lens or a camera lens) that has its entrance or exit pupil, or both, at infinity. The size of images produced by a telecentric lens is insensitive to either the distance between an object being imaged and the lens, or the distance between the image plane and the lens, or both, and such an optical property is called telecentricity. Telecentric lenses are used for precision optical two-dimensional measurements, reproduction (e.g., photolithography), and other applications that are sensitive to the image magnification or the angle of incidence of light.
The simplest way to make a lens telecentric is to put the aperture stop at one of the lens's focal points. This allows only rays including the chief rays (light rays that pass through the center of the aperture stop), that will be about parallel to the optical axis on the other side of the lens, to pass the optical system for any object point in the field of view. Commercially available telecentric lenses are often compound lenses that include multiple lens elements, for improved optical performance. Telecentricity is not a property of the lenses inside the compound lens but is established by the location of the aperture stop in the lens. The aperture stop selects the rays that are passed through the lens and this specific selection is what makes a lens telecentric.
If a lens is not telecentric, it is either entocentric or hypercentric. Common lenses are usually entocentric. In particular, a single lens without a separate aperture stop is entocentric. For such a lens the chief ray originating at any point off of the optical axis is never parallel to the optical axis, neither in front of nor behind the lens. A non-telecentric lens exhibits varying magnification for objects at different distances from the lens. An entocentric lens has a smaller magnification for objects farther away; objects of the same size appear smaller the farther they are away. A hypercentric lens produces larger images the farther the object is away.
A telecentric lens can be object-space telecentric, image-space telecentric, or bi-telecentric (also double-telecentric). In an object-space telecentric lens the image size does not change with the object distance, and in an image-space telecentric lens the image size does not change with the image-side distance from the lens.
A telecentriclens is a special optical lens (often an objective lens or a camera lens) that has its entrance or exit pupil, or both, at infinity. The...
lenses (collectively perspective control lenses) allow special control of perspective on SLR cameras by mimicking view camera movements. telecentric lenses...
occur for example on other lens or perspectives such as telecentriclens or hypercentric lens. Telecentriclens Hypercentric lens Opto-Engineering resource...
orthographic projections, such a camera would need a object-space telecentriclens, in order that projected lengths not change with distance from the...
dimetric, and trimetric projections. A lens that provides an orthographic projection is an object-space telecentriclens. A simple orthographic projection...
to their full potential due to the lack of support for 3D Displays. Telecentriclens Reflectance paper Raytrix "Lytro Company Fact Sheet" (PDF). Lytro....
Telecentriclens. Compound lens with an unusual property concerning its geometry of image-forming rays. In machine vision systems telecentriclenses are...
of the lens system; and even at infinite distance from the lens in the case of telecentric systems. The entrance pupil of the human eye, which is not...
the top. Entocentric lensTelecentriclens Markus Ulrich, Carsten Steger (2019). "A camera model for cameras with hypercentric lenses and some example applications"...
Four Thirds, the MFT system design specification does not require lenstelecentricity, a parameter which accommodated for the inaccurate sensitivity to...
updates for many of them. Lens design has been tailored to the requirements of digital sensors, most notably through telecentric designs. The image sensor...
utilizes a push broom scanner. The device's optical system uses a telecentriclens and a charged coupled device matrix with a resolution of 242x548 pixels...
Telephoto lenses, retrofocus wide angle lenses used on SLR cameras, and telecentric designs in general are less troubled by natural vignetting. A gradual...
determines the telecentricity. If the aperture stop of a lens is located at the front focal plane of the lens, then it becomes image-space telecentricity, i.e....
serving to change the size of the image or to provide image-space telecentricity. It is used for the reduction of detector size and, in instances needing...
digital cameras (such as those found in cell phones) are image-space telecentric, so that the chief rays strike the image sensor at normal incidence.[citation...
optical. Optical probing methods include laser interferometry and telecentriclensing. The CCMM coordinate system differs from standard cartesian coordinates...
with sensitive charge coupled device detectors and with some refined telecentriclenses to convert the captured photon energy into high quality images. There...
(17) (51) 1968 (With K. H. Carnell, N. C. Gortmans & C. Pataky) A telecentric camera lens for bubble chamber photography. Optica Acta 15, 187–193. (18) (52)...
Frame (1954) U.S. patent 3,278,752 Wide Angle Optical System Having a Telecentric Stop (1966) Jack Aeby – photographer of the only successful color picture...
measurement is independent of the distance to the object, due to the telecentricity principle. A common use of filar micrometers in astronomical telescopes...
The off-axis illumination of the reticle is also the cause of non-telecentricity in wafer defocus, which consumes most of the 1.4 nm overlay budget of...
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