Feb 2019
Several different types
of achromat have been
devised. They differ in
the shape of the included
lens elements as well
as in the optical properties
of their glass most notably
in their optical dispersion.
In the following, 'R'
denotes the radius
of the spheres that define
the optically relevant
refracting lens surfaces.
By convention, R1
denotes the first lens
surface counted from
the object. A doublet
lens has four surfaces
with radii R1 to R4.
of achromat have been
devised. They differ in
the shape of the included
lens elements as well
as in the optical properties
of their glass most notably
in their optical dispersion.
In the following, 'R'
denotes the radius
of the spheres that define
the optically relevant
refracting lens surfaces.
By convention, R1
denotes the first lens
surface counted from
the object. A doublet
lens has four surfaces
with radii R1 to R4.
an achromatic lens or achromat is a lens that is designed to limit the effects of chromatic and spherical aberration. Achromatic lenses are corrected to bring two wavelengths into focus on the same plane.
(... ∞oπ ~☉✎♀︎₪ xo∞ ...)
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