Achromatic lenses are corrected for chromatic aberration with respect to three wavelengths (blue, green and red). Chromatic aberration is produced by dispersion, or the variation of refractive index with wavelength, and causes different wavelengths to have different focal points.

     Using separate materials like crown glass and flint glass for the converging and diverging lens elements, the dispersion of each can be compensated for by the other thereby minimizing the total effect.

     Achromatic doublet is the simplest form of achromats including two types: cemented doublets and air-spaced doublets. Surely achromats could have multi-elements as well, which is up to its application. Usually achromatic lenses with large aperture are air-spaced. All the air-spaced achromats show exceptional performance and provided with mounts. The air gap acts as a third lens element and provides a greater degree of correction than found in a cemented lens. In this way it is possible to balance the aberrations over a fairly wide range of wavelengths so that the lenses perform well as broadband imaging devices.

     All our achromats are computer optimized to minimize aberrations and coma, and they are fully coated with either multiplayer broadband or with a single layer anti-reflection coating.

      A wide range of focal lengths and diameters are available. Please ask for sizes and focal lengths required as we can supply a wide selection of these lenses. Our optical designers are always available to assist with your special needs and our production in China is ready to meet your quantity requirements.

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