LensdistortionExamples

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Barreldistortion

Sep 25, 2017 — The first Edmund is the easiest. Just similar triangles. It converts to: f/h=WD / HFoV. So the mm units on the left cancel out, and the feet ...

Any deviation of an image from its ideal shape is called distortion. For example, if the image of a rectangle is not a rectangle, the lens that produced it is said to suffer from distortion. If you have arrived here from our Optical Aberrations page, you know where this aberration fits in the grand scheme of things. So let’s just get down to a description of the various types of distortion.

The complexity comes in when we introduce angles. Again referring to the pinhole camera, let’s define the angle between the optical axis and a line through the object point, the center of the lens and the image point as Θ. If the distance from the pinhole to the image plane is f, then the image height, y, is given by y = f*tan(Θ). A pinhole lens is distortion-free, so this equation always holds. In other types of lenses, there can be distortion, which is defined as the difference between the actual image height and the ideal image height calculated from y = f*tan(Θ).  This is, of course, f*tan(Θ) distortion.

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Pincushiondistortionlens

Pincushiondistortion

Sep 14, 2015 — With a zoom lens, the two F values indicate the maximum lens opening at the shortest and longest ends of the lens' zoom range. For a 5-6.3 zoom, ...

Brown-Conradydistortionmodel

Lens Formula: The focal length calculation is based on the lens formula, which states that the reciprocal of the focal length. is equal to the sum of the ...

By calculating a spectral index for each pixel, you can transform the hyperspectral data into a single-band image where the index values indicate the presence ...

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Tangentialdistortion

We have designed and built lenses with all of the above types of distortion correction. If your project needs distortion-corrected lenses, please give us a call at (651)315-8249, or fill out our contact us form.

For example, with a pinhole lens, the optical axis, the line between an object and its image and the line segments from the optical axis to the object point and from the optical axis to the image point form similar triangles. This means that object height and image height are always proportional and a pinhole lens can have no distortion.

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RadialdistortionFormula

Table of Contents · Objective Identification · M = L / F . · NA = ni × sinθ · FN = Field of View Diameter × Magnification · Magnification · Using an Objective with a ...

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201942 — Collimation is the process of aligning all components in a telescope to bring light to its best focus. All telescopes need to be collimated at some point.

First, the magnification of an optical system is defined as the ratio of the image height to the object height, and the magnification is assumed constant with respect to field. In other words, in a distortion-free optical system, the distance from the optical axis to any image point (the image height) is proportional to the distance from the optical axis to the corresponding object point (the object height).

A more obscure type of this aberration is stereoscopic distortion. This is the type of distortion you need to correct for if you want to image a sphere onto a plane and make sure that the image is always circular. For this type of distortion, the ideal image height is given by y = 2*f*tan(Θ/2). When plotted, stereoscopic lies between f*tan(Θ) and f*Θ distortion.

Distortionaberration

Pixel Camera, also known as Google Camera, is the official app developed by Google for Android devices to replace the default one.

Nov 18, 2020 — Parts of a Compound Microscope Each part of the  compound microscope serves its own unique function, with each being important to the ...

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Displacement Calculator. Calculate Displacement (in³/rev) based on Flow Rate and Speed. Enter Flow Rate (gpm) Enter Speed (rpm). Displacement (in³/rev)

Over the last decade, the striking ethereal glow of laser pointers (sometimes referred to as Green Laser Pointers, or GLPs) has become a familiar sight at ...

With some lenses, such as the conoscopic lenses we use for our scatterometers, we are not attempting to map an object height to an image height. We are trying to measure, for example, light scattering as a function of angle. We could do this for a lens that is corrected for f*tan(Θ) distortion, but we’d be forever taking arctangents. Our lives become much simpler when the image height is proportional to the object angle rather than the object height. In this case, the ideal image height is given by y = f*Θ. Any deviation from this ideal is referred to as f*Θ distortion.