Lens sag
id:
lens-sag-324-5219111
title:
Lens sag
text:
Lens sag is a problem that sometimes afflicts very large refracting telescopes. It is the equivalent of mirror sag in reflecting telescopes. It occurs when the physical weight of the glass causes a distortion in the shape of the lens because the lens can only be supported by the edges. A mirror on the other hand can be effectively supported by the entire opposite face, making mirror sag much less of a problem. One expensive solution to lens sag is to place the telescope in orbit around the Earth
brand slug:
wiki
category slug:
encyclopedia
description:
original url:
https://en.wikipedia.org/wiki/Lens_sag
date created:
date modified:
2023-03-03T01:00:47Z
main entity:
{"identifier":"Q1826998","url":"https://www.wikidata.org/entity/Q1826998"}
image:
fields total:
13
integrity:
13