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    Default How can i calculate eyepiece size?



    I have a very old Bushnell refractor (easily 15+ years), I got this when i was very young. I'm trying to figure out how I can determine the diameter of the eyepiece so it will fit properly into the telescope.

    Thanks in advance.

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    Measure the diameter of the eyepiece barrel (the open end, opposite the eye lens) with a ruler, tape measure, or other scale.

    Your choices are 0.965", 1.25", or 2". The most likely will be 0.965" or 1.25".


    1.25" is the current defacto standard on most consumer telescopes. 0.965" have been used on many Tasco, Bushnell and similar low-end consumer scopes that are older than about 5 - 7 years. It would be rare, quite so to find a 2" eyepiece on this class instrument.
    Last edited by AustinPSD; 01-05-2010 at 12:13 PM. Reason: typo
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