Guide To Reflector Telescopes

Have you ever looked up into the night sky and wondered what it would be like to get a closer look at the stars and galaxies? A telescope allows you to do just that and can open up a new realm of discovery and exploration. While there are many different types of telescopes to choose from, reflector telescopes are often considered to be the best option for amateur astronomers. They are relatively affordable, easy to use, and offer decent image quality. 

If you are looking to get up close and personal with the stars, you will find all the basic information you need to get started in this guide. Itl provides an overview of reflector telescopes and explain how to choose, use, and maintain one. So, sit back and relax as we walk you through the basics of reflector telescopes and help you find the perfect option for you. 

What is a Reflector Telescope and How Does it Work? 

silhouette of a telescope against night sky

A reflector telescope is an optical device used for viewing distant objects and celestial bodies. It works by focusing light from a distant object through mirrors, which then produces an image on a viewing surface.  The mirrors collect light from the sky and focus it onto a single focal point where the viewing surface, or eyepiece, is located. 

The mirrors are usually composed of two curved glass surfaces that are coated with a reflective material, such as silver or aluminum. The curved shape of the mirror helps to magnify the size of the celestial object and produce an enlarged image on the viewing surface. 

Optics of Reflector Telescopes 

A reflector telescope mounted on a tripod 

A reflective telescope primarily consists of two optics: primary mirror and secondary mirror. 

Primary Mirror

The primary mirror in a reflector telescope is concave. Meaning its surface curves inwards, with the reflective coating on the outside. It is usually made from a sheet of glass. It acts as the main element gathering light from distant objects in the night sky. The bigger the mirror, the more light it can gather, which is what primarily differentiates amateur telescopes from professional telescopes.

Secondary Mirror

The secondary mirror is mounted at an angle to the primary mirror and reflects light that the primary mirror collects onto a focal plane where the image is formed. This helps to increase the area of sky viewed by the telescope and reduce aberrations in the image produced by improper reflection.  

Benefits of a Reflector Telescope

A telescope set to observe the milky way at dawn

Reflector telescopes have become increasingly popular in recent years due to their many benefits. They offer several benefits over other types of telescopes with simple construction and affordability being their main benefits.


Reflector telescopes are relatively inexpensive compared to other types. They are great for those looking to get into astronomy without spending too much money. Thanks to their simple structure and design, these telescopes tend to be more cost efficient than other types available on the market today, including reflector telescopes. If you are looking for brands that produce relatively affordable telescopes, then you can check out Carson. To learn more about this brand, you can read The Guide to Carson Telescopes.

Image Quality

Since reflector telescopes have a larger aperture (when compared to the same sized refractor telescope) , they can produce high-quality images. They also tend to have less of an issue with chromatic aberration, which improves the overall image quality.

Limitations of Reflector Telescopes 

Despite their advantages, reflector telescopes also have some limitations

Knowing about these is important because you will be prepared to deal with them before they become a hurdle. These include:

Light Obstruction

Reflector telescopes have twin mirrors, the secondary one can partially obstruct the light, reducing contrast and causing diffraction effects.

Require Occasional Refocusing

Because the mirrors of reflector telescopes tend to have a longer focal length, they are not so suitable for astrophotography and wide-field observations.

Alignment and Balance

A reflector must be carefully aligned and balanced in order to produce optimal images

Fail to do so and it will suffer from optical aberrations such as astigmatism or coma, causing blurring or distortion in images when magnified at higher levels. You may struggle with properly balancing and aligning your reflector telescope, but it’s well worth it once you get the hang of it! 

Types of Reflector Telescopes 

Different types of telescopes

There are three primary types of reflector telescope – Cassegrain, Newtonian, and Dobsonian – each with its own set of benefits and drawbacks. 

Cassegrain Reflector Telescope

The Cassegrain telescope is a type of reflecting telescope that uses a combination of two curved mirrors in order to focus on an object in the night sky. The primary mirror is concave while the secondary mirror is hyperbolic; each mirror has its own surface properties that help to reduce or increase the amount of light that enters the telescope tube. 

The advantages of the Cassegrain telescope include its lightweight design and the ability to produce a sharp image with its unique mirror setup. On the downside, these telescopes tend to be more expensive than other reflecting types. They also require proper care such as cleaning and alignment from time to time. 

Newtonian Reflector Telescope

The Newtonian telescope is named after Sir Isaac Newton, who developed this particular reflecting instrument. It includes a concave primary mirror and a flat secondary mirror which reflects the incoming light into an eyepiece at the end of the tube so that you can observe the images. 

Some benefits of this telescope type include its low price tag, as well as its relatively small size compared to other reflectors on the market. Unfortunately, images produced by this type of telescope are not as sharp or detailed compared to those made by other types, making it less suitable for advanced observing needs. 

Dobsonian Reflector Telescope

The Dobsonian telescope is a type of reflecting telescope that utilizes a simple design. Its tube assembly consists of a primary parabolic mirror and a flat secondary mirror. It is one of the most affordable options on the market while still providing decent image quality.

It is easier to transport than other models which require extra parts for setup and tear-down. These characteristics make it a good choice for beginners and amataeur astronomoers who want an affordable, simple and stable reflector telescope.

Astrograph Reflector Telescope

Astrographs are specifically designed for astrophotography, thanks to their larger aperture and fast focal ratio, which results in capturing more light. If allows stargazers to capture deep-sky objects like nebulae and other galaxies, but it isn’t the most affordable or most beginner-friendly option.

What to Look for When Shopping for a Reflector Telescope 

Reflector telescopes are the perfect way to bring the wonders of the universe into your own backyard. Before you start shopping, it is important to consider several factors. These factors determine the quality of the telescope and its suitability for your intended use 


Reflector telescopes for beginners tend to cost between $200 to $900, while high-end telescopes can cost in thousands of dollars. When making your purchase, set a budget for yourself and be sure to include all the related costs, such as accessories and extended warranties. Research various models in your price range and compare specs to determine which one is the best fit for you. 

Your budget should be based on two factors: how much money you are willing to spend, and how often you plan to use it. The more money you are willing to spend, the better quality of reflector telescope you will find. However, if you don’t plan on using it very often, then it may not be worth spending large amounts of money on a high-end model. 


The size of the reflector telescope should also be taken into consideration when choosing one. Telescopes come in a variety of sizes, ranging from small table-top models to larger models that require mounting hardware. Smaller telescopes are easier to transport and store, while larger ones offer more features and capabilities. Consider where and how often you will be using the telescope when determining the ideal size for your needs.


A mount is important to properly set your telescope up for nighttime stargazing. You can choose between equatorial mounts and altazimuth mounts. 

Equatorial mounts are recommended for larger telescopes since they provide smoother tracking as the night sky moves across the sky. Altazimuth mounts are simpler and easier to use since they allow for gradual up-down and side-to-side movements along two axes. 

If you are new to astronomy, an altazimuth mount would likely suit your needs better than an equatorial one. 


Most reflector telescopes come with additional accessories, including filter wheels, eyepieces, adapters, and remote controls. But if you are purchasing them separately, make sure that they are compatible with your telescope model for a secure fit and optimal performance. You should also factor these accessories into your budget when shopping for a reflector telescope.  

Care and Maintenance of Reflector Telescopes 

If you want your reflector telescope to function optimally for a long period of time, you will have to be particular about its cleaning and maintenance. Here is what you should do:


Regular cleaning is essential in order to keep your lenses free from dirt and dust particles. If not removed, these particles can affect image quality when viewing distant objects or celestial bodies through your telescope’s eyepiece or viewing surface. 

Always use lint-free cloths or wipes specifically made for cleaning lenses. Never use harsh chemicals or abrasive materials as these could potentially damage your lenses, sometimes beyond repair. 


Collimating your telescope involves ensuring that all optical components, primary mirror, secondary mirror, and eyepiece, are properly aligned in order for optimal performance during observation sessions. The process typically requires specialized tools such as collimation tools or laser collimators but can also be done manually using simple trial-and-error methods. 

Proper collimation is particularly important if you plan on using higher magnifications as misalignment can lead to image distortion and other aberrations.


In addition to regular cleaning and collimating, it is also important to perform general maintenance tasks. Check screws and nuts for tightness and replace worn out parts like rubber feet which help stabilize your mount. Doing these small tasks regularly can help keep your telescope running smoothly without any issues during observation sessions.

General Tips and Advice for Using a Reflector Telescope 

Man adjusting his astronomical telescope

Here are some tips and tricks to help you use your new telescope to its full potential:

  • Prepare For Use: Before using your reflector telescope for observation sessions, make sure all components have been checked thoroughly.  
  • Set up the Mount: Depending on what type of mount you have chosen – equatorial vs altazimuth – correct setup procedures should always be followed carefully in order ensure that no harm comes to either you or your equipment. 
  • Choose the Right Observing Site: Choose an observing site that meets certain criteria such as being free from sources of light pollution and any weather elements such as strong winds or extreme temperatures. All of these factors can influence image quality negatively. 
  • Accessories and Software: While not necessarily required for observation purposes, accessories such as carrying cases or software programs can help enhance user experience. For example, carrying cases improve portability, while softwares with detailed star charts make it easier to find celestial bodies with pinpoint accuracy.


Purchasing a reflector telescope can be a daunting, yet rewarding, experience. With the right guidance and information, you can find the perfect telescope to fit your budget and needs. Consider factors like type, budget, size, mounts, and accessories, as well as care and maintenance protocols when making your purchase. With these tips in mind, you are ready to start your journey into the night sky and explore the universe in ways you never thought possible. Gather your gear, set up your telescope, and start your stargazing adventure today!