![](/file/16310/Redshift 3 (Maris Multimedia)(1998).ISO/media/astdict/h/graphics/huygens.jpg)
Huygens eyepiece.
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One of the simplest designs of telescopic eyepiece, consisting of two planoconvex lenses (see illustration). It works well on long-focus refractors, but image distortion by spherical aberration becomes apparent at short focal ratios.
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