Why aren't all Keplerian telescopes corrected by a third lens by default? - prism display punch
The telescope that I as a gift is a kind of Kepler (all eyes are convex), which is a reverse mirror image () object that I seek. Is there a practical reason why all these telescopes are not corrected with a lens of other default? Apparently, a prism can be purchased in order to correct the image of the earth. Then the widely accepted view that shows inverted blue?
Tuesday, February 16, 2010
Prism Display Punch Why Aren't All Keplerian Telescopes Corrected By A Third Lens By Default?
Subscribe to:
Post Comments (Atom)
There is no "right-up direction in the sky of the picture, no matter in an astronomical telescope. A lens or prism built into increased costs and complexity, and reflections on the glass surfaces can also reduce the brightness and contrast . In addition, production through the establishment of a common prism diffraction peak.
ReplyDeleteEach time the light is lost through a lens, the clarity and focus. No matter when you see the stars, whether the other direction, astronomers quality instead of "convenience" of having to be present.
ReplyDeleteYou will never be the concept of "Kepler used" to refer to a refracting telescope. It is, in fact, "Kepler" refers to the eye: a single convex lens, and only less expensive telescopes eyepieces and toys. It is rarely an eye less than two (Huygens or Ramsden) or three (see Kellner) lenses. Astronomical telescopes are not equipped, lenses or prisms by the loss of light assembly, the diffraction peaks, and other aberrations. There is no law in space.
ReplyDeleteAll aims to introduce the light through a small loss of light sources, and can lead to mistakes of others, like two sides of the lens must be perfectly shaped bubble of glass and cardboard or other defects. In fact, it is investing quite normal for telescopes, and often / usually see the astronomical term "South is up.
ReplyDeleteIt is common for the stunning view is recognized shown below. The cost of the additional lens was a reason, but most of the objectives can also lead to a deterioration of image quality.
ReplyDeleteBy the way, upside down and mirror image are not identical. You can read a book that toppled a look by turning on its head, but a reflection of where unreadable (light), no matter what position you put on
Telescope is usually reversed the picture. Adding another lens or a prism for the image top right of this page will absorb additional light into the telescope and is not necessary for astronomical images.
ReplyDelete