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» Support Center » Knowledgebase » Telescope Basics » What is an eyepiece?
 What is an eyepiece?
Answer An eyepiece is simply a precision magnifier. (Another name for an eyepiece is ocular.)

The eyepiece used with a telescope magnifies the image that is formed by the main optical system. There are many different kinds of eyepiece designs for various applications. The design and quality of the eyepiece can drastically affect the overall performance of the telescope system.

An eyepiece is usually described by barrel diameter and focal length. Common barrel diameters are 0.96", 1.25" and 2". 1.25” barrels are regarded as the standard for telescopes worldwide. Commonly available eyepiece focal lengths range from 2mm to 40mm. A shorter focal length eyepiece will be a higher power eyepiece when used with your telescope.

Article Details
Article ID: 1662
Created On: Feb 21 2005 09:55 AM

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