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<p>magnification and field of view. With telescopes and microscopes, however, eyepieces are usually interchangeable. By switching the eyepiece, the user can adjust what is viewed. For instance, eyepieces will often be interchanged to increase or decrease the magnification of a telescope. Eyepieces also offer varying <a href="page.php?w=field_of_view">fields of view</a>, and differing degrees of <a href="page.php?w=eye_relief">eye relief</a> for the person who looks through them.</p>

<p><big> Properties </big></p>
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