Meniscus Lens are available in either positive or negative from MT-Optics,Inc. Positive Meniscus Lenses may be used to increase the numerical aperture of a positive lens assembly, without an undue increase in the aberrations. Negetive Meniscus Lenses are the best lens form where one conjugates is relatively far from the lens or where both c onjugates are the same size of the lens.
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