![](/file/16310/Redshift 3 (Maris Multimedia)(1998).ISO/media/astdict/o/graphics/orthosc.jpg)
Orthoscopic eyepiece.
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A good general-purpose telescopic eyepiece, giving a high-quality image and good eye relief. There are various forms, but the eyepiece typically consists of a convex or planoconvex eyelens with an achromatic triplet as the field lens (see illustration).
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