Editing Talk:1791: Telescopes: Refractor vs Reflector
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Aren't there Space Vampires in Lovecraft somewhere? [[Special:Contributions/162.158.214.34|162.158.214.34]] 22:48, 27 January 2017 (UTC) | Aren't there Space Vampires in Lovecraft somewhere? [[Special:Contributions/162.158.214.34|162.158.214.34]] 22:48, 27 January 2017 (UTC) | ||
Not as such, but there are in the classic ''Queen of Blood'' [http://www.imdb.com/title/tt0060877/] and in the unfortunate "Lifeforce" [http://www.imdb.com/title/tt0089489/] . A refractor though should be able to see their interstellar umbrella [https://pluckyoutoo.files.wordpress.com/2008/08/lf17.jpg] [[User:Anthony11|Anthony11]] ([[User talk:Anthony11|talk]]) 07:05, 30 January 2017 (UTC) | Not as such, but there are in the classic ''Queen of Blood'' [http://www.imdb.com/title/tt0060877/] and in the unfortunate "Lifeforce" [http://www.imdb.com/title/tt0089489/] . A refractor though should be able to see their interstellar umbrella [https://pluckyoutoo.files.wordpress.com/2008/08/lf17.jpg] [[User:Anthony11|Anthony11]] ([[User talk:Anthony11|talk]]) 07:05, 30 January 2017 (UTC) | ||
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An important advantage of refractors that keeps them popular is the very tiny amount of internal scattered light compared to reflectors. This really stands out when viewing planets and bright objects. Everybody loves that velvety black background field that refractors can provide. [[User:ExternalMonolog|ExternalMonolog]] ([[User talk:ExternalMonolog|talk]]) 09:59, 28 January 2017 (UTC) | An important advantage of refractors that keeps them popular is the very tiny amount of internal scattered light compared to reflectors. This really stands out when viewing planets and bright objects. Everybody loves that velvety black background field that refractors can provide. [[User:ExternalMonolog|ExternalMonolog]] ([[User talk:ExternalMonolog|talk]]) 09:59, 28 January 2017 (UTC) | ||
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There can be no doubt that the original comic contains a *mirror*, not a prism. And a porro prism would not even work, because it reflects the projection by 180 degrees! Porro prisms are always used in pairs, to upright an image *without* changing the viewing direction! --[[Special:Contributions/162.158.89.43|162.158.89.43]] 12:26, 30 January 2017 (UTC) | There can be no doubt that the original comic contains a *mirror*, not a prism. And a porro prism would not even work, because it reflects the projection by 180 degrees! Porro prisms are always used in pairs, to upright an image *without* changing the viewing direction! --[[Special:Contributions/162.158.89.43|162.158.89.43]] 12:26, 30 January 2017 (UTC) | ||
::The lens of a refractor flips the image, so having a single prism would render it upright.[[Special:Contributions/172.68.90.46|172.68.90.46]] 01:48, 31 January 2017 (UTC) | ::The lens of a refractor flips the image, so having a single prism would render it upright.[[Special:Contributions/172.68.90.46|172.68.90.46]] 01:48, 31 January 2017 (UTC) | ||
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