5 Different Types of Telescopes

There is the Achromatic which was invented in 1733 and the design overcame the need for very long focal lengths in refracting celestron telescopes by using an objective made of two pieces of glass with different dispersion. Each side of each piece is ground and polished, and then the two pieces are assembled together. Achromatic lenses are corrected to bring two wavelengths into focus in the same plane. Apochromatic refractors have objectives built with special, extra-low dispersion materials. They are designed to bring three wavelengths into focus in the same plane. Such telescopes contain elements of fluorite or special, extra-low dispersion (ED) glass in the objective and produce a very crisp image that is virtually free of chromatic aberration. Equatorial Newtonian reflector’s light gathering source is set into the “bottom” of the tube, and a small, flat secondary mirror directs the light into the eyepiece, which sits in the focused on the upper end of the tube. Dobsonian Newtonian reflectors, the telescopes work in both ways the OTA (optical tube assembly) and the base. The OTA is typically a Newtonian reflector made with a solid tube or a truss tube assembly. 

Schmidt-Newton telescope combines elements from both the Schmidt camera and the Newtonian telescope. In this system the parabolic primary mirror common in Newtonian reflector is replaced by a spherical mirror, which introduces spherical aberration. They all perform to the fullest and you will also see the difference once you give it a try. And when you are happy with the kind of results you can perhaps recommend it to other people who want to try it out.

Just because maybe you are not interested in it doesn’t mean the next person isn’t too, spread the word and see how other people will like it. And maybe one day their names will be on the news because of they have discovered something.