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Formulas and Guidelines for Optical Lens Selection

From Navitar, Inc.

The information on this page is a compilation of basics intended to assist you in selecting the best optical components and systems for your specific applications.
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Optical Lenses
Optical lenses are transparent components made from optical-quality materials and curved to converge or diverge transmitted rays from an object. These rays then form a real or virtual image of the object.  This area includes micro lenses.
Neutral Density Filters
Neutral density filters are designed to reduce transmission evenly across a portion of the spectrum. They are slightly sensitive to angles but they are much more forgiving than interference filters.
Achromats
Achromats consist of two or more elements, usually of crown and flint glass, that have been corrected for chromatic aberration with respect to two selected wavelengths.  They are also known as achromatic lenses.  This area includes micro achromats as well.
Spherical Lenses
Spherical lenses, also known as singlets, are transparent optical components consisting of one or more pieces of optical glass with surfaces so curved that they serve to converge or diverge the transmitted rays from an object, thus forming a real or virtual image of that object.  This area includes micro spherical lenses as well.
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