Comments on: How does a newtonian reflecting telescope work? http://www.telescopebuyingguide.com/blog/how-does-a-newtonian-reflecting-telescope-work/ Wed, 08 Feb 2012 23:36:54 +0000 http://wordpress.org/?v=2.7 hourly 1 By: Fred http://www.telescopebuyingguide.com/blog/how-does-a-newtonian-reflecting-telescope-work/comment-page-1/#comment-2425 Fred Sat, 06 Feb 2010 04:36:51 +0000 http://www.telescopebuyingguide.com/blog/how-does-a-newtonian-reflecting-telescope-work/#comment-2425 You can't see the spider vanes for the mirror because their simply too close. Maybe thats too simple of an answer. but you can't see it for the same reason you cant see a pencil held right in front of a pair of binoculars. To bring it into focus an object needs to be much further away.<a href="http://www.resumeminers.com/Continuing-Education/Taf.htm"> Fred</a> You can’t see the spider vanes for the mirror because their simply too close. Maybe thats too simple of an answer. but you can’t see it for the same reason you cant see a pencil held right in front of a pair of binoculars. To bring it into focus an object needs to be much further away. Fred

]]> By: Andrew S http://www.telescopebuyingguide.com/blog/how-does-a-newtonian-reflecting-telescope-work/comment-page-1/#comment-2424 Andrew S Thu, 04 Feb 2010 19:49:21 +0000 http://www.telescopebuyingguide.com/blog/how-does-a-newtonian-reflecting-telescope-work/#comment-2424 The central obstruction is before the light is focussed by the telescope. Consider a star anywhere in the field of view. What point of the mirror does the light from that star hit? It should be obvious that if you ignore the central obstruction the light from that one star shines on the entire surface of the mirror, not just one point. The whole job of the telescope is to sort out these rays of light so that there is a 1:1 correlation between the _direction_ of incoming light rays and the _position_ of those light rays on the focal plane. So the light of stars in the middle of the field of view hit the edges of the mirror and are directed to the centre of the image further along the optical path. The "hole" in the image is all over the image in the form of lost light making a dimmer image, not concentrated in one position of the resulting image.<a href="http://www.currencyexchangemarket.com/electronic-currency-exchange.htm"> Andrew S</a> The central obstruction is before the light is focussed by the telescope. Consider a star anywhere in the field of view. What point of the mirror does the light from that star hit? It should be obvious that if you ignore the central obstruction the light from that one star shines on the entire surface of the mirror, not just one point.

The whole job of the telescope is to sort out these rays of light so that there is a 1:1 correlation between the _direction_ of incoming light rays and the _position_ of those light rays on the focal plane. So the light of stars in the middle of the field of view hit the edges of the mirror and are directed to the centre of the image further along the optical path.

The “hole” in the image is all over the image in the form of lost light making a dimmer image, not concentrated in one position of the resulting image. Andrew S

]]> By: Chandramohan P.R http://www.telescopebuyingguide.com/blog/how-does-a-newtonian-reflecting-telescope-work/comment-page-1/#comment-2423 Chandramohan P.R Wed, 03 Feb 2010 23:13:58 +0000 http://www.telescopebuyingguide.com/blog/how-does-a-newtonian-reflecting-telescope-work/#comment-2423 The eye piece covers only the diagonal mirror area. It does not show the spider upon which the small diagonal mirror is fixed. The reflections from main mirror is focussed into a point where the diagonal mirror is placed.The field of eye piuece covers only this diagonal mirror area.<a href="http://www.besthomeorganizers.com/663"> Chandramohan P.R</a> The eye piece covers only the diagonal mirror area. It does not show the spider upon which the small diagonal mirror is fixed.
The reflections from main mirror is focussed into a point where the diagonal mirror is placed.The field of eye piuece covers only this diagonal mirror area. Chandramohan P.R

]]>