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A type of eyepiece design consisting of one achromatic doublet lens and one plano-convex lens whose convex surfaces face each other. It creates a field of view greater than 50°, hence the wide-field denotation in the name. It is designed for use with high power achromatic objectives.
See also Kellner Eyepiece , Achromatic Objective , Huygenian Eyepiece , Periplan Eyepiece
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