What isfocal lengthof lens

The essential dispersion of the diffractive element “secondary spectrum” is bigger than the full refractive achromatic doublet. Also secondary spectrum of Hybrid achromatic doublet is negative

Apochromatic correction means that the lens provides correction of chromatic aberrations for 3 selected wavelengths for the elimination of secondary spectrum.

For satisfying this condition, unusual glasses with particular relations of V and P are required. Those are glasses with special dispersion behavior.

The residual spectrum can be decreased below the diffraction limit as a result of diffraction in a given optical system.

Focal length Comparisonface

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Spherochromatism should be corrected additionally using additional lens parameters. There can be residual color difference for other aberrations: coma, field curvature and distortion

It is not possible to reach ideal color correction because of very different dispersion behavior of real existing glasses. Only correction for several wavelengths within a wavelength region is possible.

Focal length comparisonportrait

Some residual spherical aberration can be seen for other wavelengths inside of the working band despite color correction.

Explore what is optical aspheric lens, its role in reducing spherical aberration, and the advantages of aspherical optics in enhancing image quality.

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Super Apochromatic correction means that the lens provides correction of chromatic aberrations for 4 selected wavelengths.

Besides Long Crown glass and Short Flint glass, additional glass is used to get better design result, for example Dense Flint – SF type

In many applications of lens design, avoiding chromatic aberrations is a key performance requirement. In this video, we review some of the causes of chromatic aberrations and methods to correct them.

Focal length comparisontelescope

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2) The Abbe number of the diffractive element is negative. The hybrid achromatic lens with positive optical power should be composed of a positive refractive element and a positive diffraction one. The “crown element” of a hybrid achromatic doublet will have smaller optical power to the whole achromatic lens.

To correct chromatic aberrations, glasses with different V are needed. Usually it is “Crown glass” with higher V and “Flint glass” with lower V

Focal length comparisonAPSC

Where V_d=(n_d-1)/(n_F-n_C ) is Abbe numbern_d – index of refraction of the d-line of spectrumn_F – index of refraction of the F-line of spectrumn_C – index of refraction of the C-line of spectrum

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Focal length comparisongif

– An achromatic doublet can eliminate the difference of a couple of selected wavelengths but there is focus difference for other wavelengths. This difference is called “secondary spectrum”

– If a doublet needs to have a positive, then the optical power of the positive element has to be bigger than that of the whole doublet

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Usually spherical aberration is corrected for one wavelength of spectral waveband, for example for green in the visual band.

The task is difficult for a system with high aperture because the correction of spherochromatism is going to be more difficult.

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Lateral color if not corrected appears in the field of view. If can be seen in a simple eyepiece when you look through the FOV from the center to the edge of field

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Some eyeglass lenses have factory-applied AR coating on both lens surfaces. Other lenses, particularly progressive lenses and other multifocal lenses (i.e., ...

Focal length comparisoncamera

With over 15 years of experience and 500+ unique optical systems designed, Optics for Hire specializes in advanced optical engineering. If it uses light, we've worked on it.

The Chromatic difference of spherical aberrations or spherochromatism can appear in achromatic corrected lens with large aperture.