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Thread: Sticky: Evolution of Eyepiece Design

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    Default Sticky: Evolution of Eyepiece Design

    The free pdf monograph “Evolution of the Astronomical Eyepiece” by Chris Lord is to be found at

    This is located on the website of Brayebrook Observatory, a private observatory run C.J.R. Lord D.Phil.,B.Ed.,F.R.A.S. which is used almost exclusively for double star astrometry. The homepage of the observatory is located at the link

    However navigation of the site most readily proceeds from

    There is much material on telescopes, instrumentation and observatory construction. In addition to the eyepiece evolution history other publications and resources can be found at


    For each type of eyepiece the apparent field of view, eye relief as a fraction of focal length, and the speed of the telescope for which the eyepiece is designed is listed along with the name of the design and date of introduction. A one-page summary is on page 8. The text further discusses aberrations, ghosting, and transmission characteristics. Note that the author is an astrometric double star observer and so has a low tolerance for distortion in wide field eyepieces and some judgments are made from that point of view. This does not detract from setting out the facts of eyepiece designs and their history comprehensively.

    Last edited by bladekeeper; 01-24-2018 at 06:17 AM. Reason: Dup
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