This broadband anti-reflective (AR) coating provides a low level of reflectance across a wide spectrum from 400-1100nm, reflecting less than 1.0% average. Standard and custom coatings are available for refractive indices of 1.46 to 1.90.

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This high efficiency broadband anti-reflective (AR) coating reflects less than 0.5% average from 425-675nm. Higher performance specifications are also available. Standard & custom coatings are available for refractive indices of 1.46-1.90.

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This broadband anti-reflective (AR) coating is particularly designed for the ultra-violet (UV) region. It provides a low level of reflectance less than 0.5% average from 275-425nm. Standard & custom coatings are available for refractive indices of 1.46-1.90.

This Mid Wave Infrared (MWIR) Anti-Reflective (AR) coating provides a low level of reflectance for the mid-infrared spectrum (3000nm to 5000nm). Band averaged reflectance is less than 1.0% at normal incidence.

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Often, our customers need a custom Anti-Reflective (AR) coating that is tailored to meet their specific requirements. The ZC&R Coatings for Optics division of Abrisa Technologies has developed thousands of Anti-Reflective (AR) coatings to fulfill such needs. If you have a custom Anti-Reflective (AR) requirement just let us know, and we will be happy to submit a design curve for your review.

Practically, it looks like your photo is of a tilted scale. The primary aberration is likely defocus. Again, from a practical point of view, it would be hard to tease out what is longitudinal chromatic aberration and what is spherochromatism. For one thing, it would help a lot to have images taken at different f/#s. (Since the spherical aberration varies with used f/#). I'm not saying it couldn't be done, but most people would measure the MTF at different colors and use that information. All of the aberrations get wrapped into the MTF, so it is an all-encompassing measure.

This narrow band anti-reflective (AR) is an excellent coating for targeting a single wavelength or very narrow band of wavelengths. Standard < 0.25% and high performance < 0.05% reflectivity specifications are available.

This narrow band anti-reflective (AR) is an excellent coating for targeting a single wavelength or very narrow band of wavelengths at or near 1550nm. Standard < 0.25% and high performance < 0.05% reflectivity specifications are available.

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Spherochromatism is simply the change in longitudinal chromatic by lens zone. Both aberrations are closely related. If you have a lens with longitudinal, there will be some change in color focus by lens zone (spherochromatism). The use of conventional optical glass in long lenses was not able to control either longitudinal nor the spherochromatism to a great degree. Stopping down the lens to avoid the poorly corrected marginal rays was necessary to attain an acceptable image. With the advent of low dispersion glass, both problems were nearly eliminated. I view spherochromatism as a subset of longitudinal chromatic. Fringing in the picture is from longitudinal chromatic. To say that an optic has spherochromatism, one must compare color focus of various lens zones (Paraxial, zonal and marginal). You would need 3 pictures; one for each lens zone to determine if the optic had noticeable spherochromatism.This cannot be determined in a single picture. The green fringing (mid spectrum) indicates that the chromatic is not lateral chromatic.

The first group is made up of AR coatings that target one or more broad wavelength bands. Our BARC coatings are examples of this group.

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These Anti-Reflective (AR) coatings are all dielectric, single or multi-layers, and are designed for low reflectance and high transmittance in the UV, visible, and near IR spectral bands. AR coatings meet the requirements of MIL-C-675C, MIL-C-14806A, and MIL-C-48497A. AR Coatings are often crucial components in optical systems with multiple lenses or other optics where the maximum possible light energy is needed. AR coatings help to produce brighter images while reducing the intensity of ghost images which may otherwise be produced in optical systems having multiple reflecting surfaces.

In particular, how do we identify the following image as primarily an example of spherochromatism and not longitudinal CA?

This broadband anti-reflective (AR) coating is particularly designed for telecommunication applications. It provides a low level of reflectance to less than 0.25% average from 1450-1650nm. Standard & custom coatings are available for refractive indices of 1.46-1.90.

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Note that transverse aberrations (the size of the spot in the plane perpendicular to the optical axis) behave differently than longitudinal aberrations. A topic for a different time.

In lens design textbooks, a distinction is often made between longitudinal chromatic aberration and spherochromatism. (See for instance Kingslake's lens design book.) What is simple way to understand the difference? As far as I can tell, both involve the focal plane varying in distance from the lens as the wavelength of the light changes.

This Long Wave Infrared (LWIR) Anti-Reflective (AR) coating provides a low level of reflectance for the far-infrared spectrum (8µm to 12µm). Band averaged reflectance is less than 1.0% at normal incidence.