Everything about Doublet Lens totally explained
In
optics, a
doublet is a type of
lens made up of two
simple lenses attached together. The lenses are made from glasses with different
refractive indices and different amounts of
dispersion. Often one element is made from
crown glass and the other from
flint glass. This combination produces a better image than a simple lens.
Trilobites, which are now extinct, had natural doublet lenses.
Doublets can come in many forms, though most commercial doublets are
achromats, which are optimized to reduce
chromatic aberration while also reducing
spherical aberration and other
optical aberrations.
Apochromats can also be made as doublets.
In a cemented doublet, the lenses are held together by an
adhesive, such as
Canada balsam or
epoxy. Some doublets use no adhesive between the lenses, relying on external fixturing to hold them together. These are called air-spaced doublets.
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