A Schmidt-Newtonian telescope is a combination scope which takes elements from the Schmidt camera and the Newtonian telescope. The result is a scope designed to counter aberrations.
At this point in time, Meade is the only manufacturer to produce the Schmidt-Newtonian (SN) scope. Apertures are available in 6", 8" and 10", and the devices themselves have been made with the amateur astronomer in mind, with price points within a range that would accommodate beginners. As a result, one can speculate that this may have impacted the quality of available scopes. Consumer reviews are a good way to better assess whether or not a Schmidt-Newtonian is for you.
Design-wise, the Schmidt-Newtonian is similar to a Maksutov-Newtonian or Mak-Newt, with the exception of the corrector plate. The SN scope takes the basic construction of Newtons telescope and replaces the normal parabolic mirror with a spherical mirror. Consequently, this change introduces spherical aberration, which is then countered by the addition of the Schmidt camera's corrector plate. (The Schmidt plate is also used in Schmidt-Cassegrain telescopes.)
The original idea was to create a telescope with a wide field of view unhindered by significant aberration. While the Schmidt-Newtonian still experiences some coma (or comatic aberration), it's less so than that of a traditional Newtonian device. Given the same focal ratio (diameter of the scope's virtual aperture), the Schmidt-Newtonian should have a sharper focus. This is especially true for shorter focal ratios. As noted, Meade manufactures apertures of 6" to 10".
Yourname... said:
æ¤è¨ã«å¤ããã
Sunday September 21, 2008, 03:08 PM
Yourname... said:
ã¯ãã
Sunday September 21, 2008, 03:19 PM
Yourname... said:
è¦ã¦ãã
Sunday September 21, 2008, 03:42 PM
Yourname... said:
è¦ã¦ãã
Tuesday September 23, 2008, 03:15 PM
Yourname... said:
è¦ã¦ãã
Tuesday September 23, 2008, 03:57 PM
Yourname... said:
è¦ã¦ãã
Tuesday September 23, 2008, 04:33 PM
Haha, shouldn't you be charging for that kind of kownledge?!
Saturday July 2, 2011, 01:19 PM
Do you have something to say about Schmidt Newtonian Telescopes? Write your comments in the space provided below.
Bookmark this page with:
Delicious
Digg
reddit
Facebook
StumbleUpon
Small moves add up in commercial space
Science editor Alan Boyle's blog: Commercial ventures have been taking lots of small steps toward th...
Space voyages shouldn't be politically incorrect
Why should politicians support trips beyond Earth orbit? It's good for jobs in the short term, and g...
Check out the Red Planet's craziest colors
Science editor Alan Boyle's blog: A picture from NASA's Mars Reconnaissance Orbiter paints the Red P...
Asteroid Eros draws skywatchers in Earth flyby
Amateur astronomers and students around the world are taking a close look at the asteroid Eros as pa...