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Newtonian Reflector Telescope Optical Tube Assemblies

 
 

A reflector telescope, often referred to as a Newtonian in deference to its inventor, Isaac Newton, uses mirrors to gather cosmic light, allowing us to see celestial objects that would otherwise be invisible to the naked eye. The light gathered from the aluminized primary mirror at the back of the telescope reflects up the tube assembly to a small secondary mirror, which is angled perfectly so as to direct the beam of light into an eyepiece and finally, your waiting eye. You can see why it is called a reflector!


Since we are talking about a Newtonian Reflector OTA (optical tube assembly) instead of a complete reflector telescope, it is important to understand when it makes sense to buy an OTA. If you already own a mount that can handle the weight of the Newtonian optical tube you are considering, that makes sense! Alternatively, you may want a specific mount and a specific reflector OTA that is not sold together as a package. However, if you do not already own a mount nor want to create a custom package, take a look at the Newtonian Reflector Telescopes to see if you can find a package that suits your needs...you will most certainly save money that way!


Regardless of whether you choose a Newtonian Reflector OTA or a Newtonian Reflector Telescope package, it is important to consider the telescope's focal ratio. Sure, the aperture and focuser are also important factors, but the focal ratio will dictate whether you can use the OTA visually, or whether it is only suited for astrophotography. Most of our Imaging Newtonians and Astrographs are noted as such, so if you are interested in visual use, check the reflector OTA you have in mind to make sure it will work for your purposes. Alternatively, most any reflector can be used for astro-imaging to some degree as long as it is on a good equatorial mount, although it makes sense to investigate the specifications of both your camera/sensor size and the telescope to get a good match.


If you need help choosing a Newtonian Reflector OTA that will be best suited for your applications, feel free to contact one of our non-commissioned product advisors by phone or email. We are here to help and want your experience in astronomy to be the best it can be!