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What is an "Eyepiece"?
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telescopes knowledge   An eyepiece is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes. It is called an eyepiece because it is usually the lens that is closest to the eye when someone looks through the device. The objective lens or mirror collects light and brings it to focus creating an image. The eyepiece is placed at the focal point of the objective to magnify this image. The amount of magnification depends on the focal length of the eyepiece.

An eyepiece consists of several lens elements in a housing with a barrel on the bottom. The barrel is shaped to fit in the opening on a telescope. The image can be focussed by moving the eyepiece nearer and further from the objective, and most instruments have a focusing mechanism to allow this without requiring that the eyepiece be manipulated directly.

The eyepieces of binoculars are usually fixed in place, causing binoculars to have a pre-determined 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 fields of view, and differing degrees of eye relief for the person who looks through them.

Modern research-grade telescopes do not use eyepieces. Instead, they have high-quality digital cameras mounted at the focal point, and the images are viewed on a computer screen. Some amateur astronomers use their telescopes the same way, but most still look through eyepieces.

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Eyepiece Designs
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subject related telelscopes  Technology has developed over time and there are a variety of eyepiece designs for use with optical telescopes. They vary in their internal lens configuration, and different designs are sometimes more appropriate both for different types of viewing, and for different types of telescope. Some eyepiece designs are:

Huygens
Ramsden
Orthoscopic
Kellner
Erfle
Plossl
Nagler

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Telescope Reviews
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  Telescope reviews from our clients and end users. Please feel free to post your own comments.
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More Accessories
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| telescope eyepieces | telescope erecting lenses | telescope roof prisms | telescope mirrors | telescope filters |
| telescope barlow lenses | finder scopes | telescope camera adapters | equatorial telescope mounts |
| telescope motor clock driver | telescope hand control box | telescope tripods | other accessories/parts |
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