Newtonian Telescopes

Newtonian Telescopes, invented by Sir Isaac Newton, are often less expensive than other Astronomy Optics Designs that have the same size aperture. They provide wide field views due to their short focal length and are very efficient with light gathering because of their fast focal ratios. Newtonians, as they are commonly called, are generally much more portable than the larger Dobsonian Telescopes, which have the same optics design. They also make for fantastic imaging Telescopes because their fast focal ratios and because they are free of chromatic aberrations. Not only are these Telescopes used for Astrophotography, they are also great for visual astronomers as well. Take a look below to see the pros and cons of the Newtonian Telescope design.

 

Newtonian Telescopes, invented by Sir Isaac Newton, are often less expensive than other Astronomy Optics Designs that have the same size aperture. They provide wide field views due to their short focal length and are very efficient with light gathering because of their fast focal ratios. Newtonians, as they are commonly called, are generally much more portable than the larger Dobsonian Telescopes, which have the same optics design. They also make for fantastic imaging Telescopes because their fast focal ratios and because they are free of chromatic aberrations. Not only are these Telescopes used for Astrophotography, they are also great for visual astronomers as well. Take a look below to see the pros and cons of the Newtonian Telescope design.

 

Advantages & Disadvantages of Newtonian Telescopes

Advantages: One of the best things about their design is that they are very simple, yet still yield a large aperture for a lower cost. They have a very wide field of view so they can be excellent for imaging or viewing deep sky objects. Smaller apertures like 8 inches can be fairly portable, averaging around 30 inches in length. The cooldown time is also very short for these types of Telescopes because they usually have an open tube. Lastly, they almost always have a short focal length which means they have fast focal ratios.

 

Disadvantages: Because this design gives you wide-angle views and shorter photo times, you need very good quality eyepieces in order to get sharp images from one edge to another. Shorter focal lengths also make it harder to get high magnification. So if you plan to get a Newtonian Telescope you should also plan to get some great eyepieces along with it. There is some maintenance that needs to be done with these, especially after transporting them. They also have something called "coma" where stars appear oddly shaped at the edge of images. This is usually self-corrected when the focal ratio is faster than f/6.