{"id":45448,"date":"2023-06-06T07:35:06","date_gmt":"2023-06-06T07:35:06","guid":{"rendered":"https:\/\/www.skyatnightmagazine.com\/?p=118914"},"modified":"2023-06-06T08:32:28","modified_gmt":"2023-06-06T08:32:28","slug":"eye-relief-explained","status":"publish","type":"rss_feed","link":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/rss_feed\/eye-relief-explained\/","title":{"rendered":"Eye relief explained"},"content":{"rendered":"

What is the eye relief of an optical instrument like a telescope? <\/p>

By Steve Richards\n \t\t<\/p>

Published: Tuesday, 06 June 2023 at 12:00 am<\/p>

\n\n

Eye relief is the fixed distance from the curved surface of a telescope eyepiece\u2019s outermost lens \u2013 the eye lens \u2013 to the point at which you can observe the whole field of view without vignetting<\/a> \u2013 the exit pupil.<\/p>\n

In a nutshell, eye relief refers to how far your eye must be from the eyepiece in order for you to see the entire field of view.<\/p>\n

The longer the eye relief, the more comfortable the observing experience becomes.<\/p>\n

If you suffer from astigmatism, wearing corrected spectacles while observing can generally be beneficial \u2013 but wearing spectacles forces your eye further from the eye lens, so spectacle wearers in particular should choose eyepieces with a long eye relief.<\/p>\n

A bigger distance (called longer eye relief) is useful if you wear glasses.<\/p>\n

Find out more in our beginner\u2019s guide to eyepieces<\/a>.<\/p>\n

Email your astronomy queries to us at contactus@skyatnightmagazine.com and they could appear in a future issue of BBC Sky at Night Magazine.<\/strong><\/em><\/p> <\/body><\/html>\n

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