Acromatic doublets are cemented achromats consisting of two different lenses: Positive low dispersion crown glass and negative high dispersion flint glass.
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Multi-element Lenses
An economical achromat for general use, suitable for an optical system that does not require high surface quality imaging, such as a microscope or telescope objective.
By combining two lenses with different wavelength dispersion and refractive index, the resulting component provides lower spherical aberration and chromatic aberration than a single spherical lens.
A cylindrical achromat is a single component made by joining two cylindrical surface lenses with different refractive indices.
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