Editing Talk:1522: Astronomy
Please sign your posts with ~~~~ |
Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.
The edit can be undone.
Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.
Latest revision | Your text | ||
Line 38: | Line 38: | ||
I'd love to see a good explanation of the optics at play and the differences between telescopes and magnifying lenses. E.g. from {{w|Focal length}}: ''In most photography and all telescopy, where the subject is essentially infinitely far away, longer focal length (lower optical power) leads to higher magnification and a narrower angle of view; conversely, shorter focal length or higher optical power is associated with a wider angle of view. On the other hand, in applications such as microscopy in which magnification is achieved by bringing the object close to the lens, a shorter focal length (higher optical power) leads to higher magnification because the subject can be brought closer to the center of projection.'' And the reference to "resolving distance" seems like a misinterpretation. For a good time, watch [https://en.wikipedia.org/wiki/File:Identifiable-Images-of-Bystanders-Extracted-from-Corneal-Reflections-pone.0083325.s001.ogv Stepwise magnification by 6% per frame into a 39 megapixel image. In the final frame, at about 170x, an image of a bystander is seen reflected in the man's cornea.] [[User:Nealmcb|Nealmcb]] ([[User talk:Nealmcb|talk]]) 15:11, 9 May 2015 (UTC) | I'd love to see a good explanation of the optics at play and the differences between telescopes and magnifying lenses. E.g. from {{w|Focal length}}: ''In most photography and all telescopy, where the subject is essentially infinitely far away, longer focal length (lower optical power) leads to higher magnification and a narrower angle of view; conversely, shorter focal length or higher optical power is associated with a wider angle of view. On the other hand, in applications such as microscopy in which magnification is achieved by bringing the object close to the lens, a shorter focal length (higher optical power) leads to higher magnification because the subject can be brought closer to the center of projection.'' And the reference to "resolving distance" seems like a misinterpretation. For a good time, watch [https://en.wikipedia.org/wiki/File:Identifiable-Images-of-Bystanders-Extracted-from-Corneal-Reflections-pone.0083325.s001.ogv Stepwise magnification by 6% per frame into a 39 megapixel image. In the final frame, at about 170x, an image of a bystander is seen reflected in the man's cornea.] [[User:Nealmcb|Nealmcb]] ([[User talk:Nealmcb|talk]]) 15:11, 9 May 2015 (UTC) | ||
:If you (or anyone else) know enough about this, it would be great if you would correct the misinterpretation and maybe add some details. The above could be linked to via wiki. Or it could be a trivia section, if it is too much in the main explanation. I do not know enough about this to make a good explanation. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 08:24, 11 May 2015 (UTC) | :If you (or anyone else) know enough about this, it would be great if you would correct the misinterpretation and maybe add some details. The above could be linked to via wiki. Or it could be a trivia section, if it is too much in the main explanation. I do not know enough about this to make a good explanation. --[[User:Kynde|Kynde]] ([[User talk:Kynde|talk]]) 08:24, 11 May 2015 (UTC) | ||
− | |||
− | |||
[[Media:The Astonomer.jpg|Statue in Canberra, Australia of an astronomer with magnifying glass]] {{unsigned|Multimotyl}} | [[Media:The Astonomer.jpg|Statue in Canberra, Australia of an astronomer with magnifying glass]] {{unsigned|Multimotyl}} | ||
− | You're all forgotten how early astronomy was done. At the turn of the century, photographs were taken through the telescope, developed, and only later analyzed closely - | + | You're all forgotten how early astronomy was done. At the turn of the century, photographs were taken through the telescope, developed, and only later analyzed closely - WITH A MAGNIFYING glass! This allowed for careful tracking and analysis of the many stars that might be visible from just one frame. (It also allowed observation of the same area of the sky at different days, or even at different years, to see which stars were moving relative to others.) For more, look into [http://www.smithsonianmag.com/history/the-women-who-mapped-the-universe-and-still-couldnt-get-any-respect-9287444/?no-ist The Women Who Mapped the Universe] [[User:Jorgbrown|Jorgbrown]] ([[User talk:Jorgbrown|talk]]) 20:08, 11 May 2015 (UTC) |
− | |||
− |