CRYSTECH, Inc. Datasheets for 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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Product Name Notes
Cylindical Lens: Used to provide focusing power in one section only. For illumination or detection of light from line sources. Also used to anamorphic compression of beams and images.
Double-concave Lens: Negative lens with the form most suited to producing diverging light or a virtual image, where the input light is converging.
Double-convex Lens:Most suitable where the conjugates are on opposite sides of the lenses and the ratio of the distances is less than 5:1, e.g. as simple image relay components.
Meniscus(Negative) Lens: The best lens form where one conjugates is relatively far from the lens or where both conjugates are the same size of the lens.
Meniscus(Positive) Lens: These lenses may be used to increase the numerical aperture of a positive lens assembly, without an undue increase in the aberrations.
Plano-concave Lens: Negative lens with the form most suitable where one conjugates is more than five times the other, e.g. producing divergent light from a collimated input beam.
Plano-convex Lens:Positive focus length. Most suitable where one conjugate is more than five times the other, e.g. in sensor application or for use with near collimated light.