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Glossary > Telescope accessories > General > Type of build > ED eyepiece

Glossary | Telescope accessories | General | Type of build | ED eyepiece

Eyepieces with an ED element, as seen in apochromatic binoculars.

ED eyepieces have a very low colour variation and therefore offer good contrast.

The integrated ED elements have very low dispersion. Usually, these eyepieces also offer large eye relief for a comfortable viewing position, and are also suitable for spectacle wearers.