dobsonian vs cassegrain

Dobsonian vs Cassegrain- Which One to Pick?


Choosing between two similar products can be a hard decision to make. This is the case for dobsonian and cassegrain. Both are magnificent telescopes that are unique in their own way. 

So, what is the difference between dobsonian and cassegrain?

Firstly, a dobsonian telescope is much cheaper than a cassegrain. Dobsonian telescopes are also lighter and smaller than cassegrain. The focal length of a cassegrain is longer than a dobsonian. However, the dobsonian offers a more brilliant, colorful image than the cassegrain. The dobsonian is also easier to use

Still, confused? We get it. It can be like that sometimes. But don’t worry, we have a way to clear out your confusion. 

Just read along with us, it’ll clear out all your confusion. 

Dobsonian vs Cassegrain- Basic Differences 

The two most common reflector variations are dobsonian and cassegrain. The fact that they’re so similar makes it hard to choose between these two. Just like how it’s hard to choose between nanuk and pelican

You would need to first know the basic differences to make a decision. So, let’s start looking for those differences-  

Aspects  Dobsonian Cassegrain
Price $500- $1300 $2200-$4499
Focal Length  Short Long
Weight  Lighter  Heavier 
Image Brightness Brighter  Less bright 
Ease of Use Easy Moderate easy 

You still didn’t get the full picture, did you? We thought you wouldn’t. That is why we have a detailed comparison in our next section. So, just keep reading!

Dobsonian vs Cassegrain- Detailed Comparison 

When you’re in the market for telescopes you would want to get the full specifications. It’s almost like when you’re looking for differences between pvs7 and pvs 14

So, to help you even more we have a detailed comparison between dobsonian and cassegrain. Let’s see what they are.


In terms of pricing, the dobsonian is clearly the winner. A dobsonian costs around $500- $1300. This is considerably cheaper if you compare it with a cassegrain.

A cassegrain costs somewhere between $2200 to $4499. This is more than double the price of a dobsonian. 

Winner: In terms of price the dobsonian is the winner. 

So, you might be tempted to buy a dobsonian based on its price. However, this is not the full story. You’ll have to consider other factors before purchasing one. So, let’s find out the other differences. 

Focal Length 

The focal length of Dobsonians and reflector telescopes is typically short. Cassegrain telescopes, on the other hand, have a long focal length. 

If you’re familiar with telescopes, you might be aware of one thing. And that is- the higher the magnification, the longer the focus.

Magnifications range from 250 to 1,000 in cassegrain telescopes. Cassegrain lenses are widely utilized for planetary work due to their larger focal length. This is why the exit pupil in cassegrain for 10″ to 16″ is between 0.5mm and 2mm.

The aperture of the dobsonian telescope is 10. You will, however, need to acquire additional telescope attachments. This is due to the fact that it only comes with a 25mm eyepiece.

Winner: Cassegrain is the winner. 


A cassegrain will usually be a little heavier than a dobsonian. This is related mostly to the amount of glass in each telescope. 

A cassegrain has more glass than a dobsonian. A dobsonian becomes lighter as a result of this.

Due to the polemaster’s big focal length, they’re also heavier.  

You can use some mount carriers for your cassegrain telescopes. This will make them easier to carry around. 

We have recommended some good quality mount carriers for you- 

Product 1
Product 2

Feel free to use them if you like. Now, let’s move on to the other parts. 

Winner: In terms of weight, the dobsonian is the winner. This is because it is way lighter. 

Image Brightness

With a dobsonian telescope, you’ll get brighter photos with more ‘Pop’. This isn’t to argue that a cassegrain produces a poor image. 

A cassegrain also produces high-quality clear images. In fact for longer ranges, the picture quality of a cassegrain is much better. 

With a dobsonian, however, you’re more likely to obtain a more brilliant, colorful image. 

Winner: In terms of image brightness, the dobsonian is clearly the winner. 

Easy To Use

The level of ease is an important factor when searching for products. If you search for the best quality nebula filter, you’d want to see if it’s easy to use or not. The same thing you’ll need to know for dobsonian and cassegrain. 

When it comes to an easy-to-use telescope for beginners, a dobsonian is the clear leader. This is because it’s smaller and lighter. So, it can be carried anywhere easily. 

The dobsonian also has a special kind of mount. The Altazimuth mount allows for easy vertical and horizontal rotation of the telescope. This is extremely easy to use and for beginners, this is like a dream. 

On the other hand, the mount on the cassegrain telescopes is like normal telescope mounts. They are definitely harder to use. If you’re a beginner you’ll find these mounts considerably complicated to use. 

Winner: In terms of ease to use, the dobsonian is the winner. 

Final Verdict 

You probably already decided which one you want to buy. However, we would still like to help you out a bit more. 

You can be someone who doesn’t want to buy a telescope for professional use. In that case, we suggest you go for the dobsonian. It’s way cheaper than the cassegrain and it’s perfect for beginners. 

Now, if you’re in the market for professional reasons,  go for the cassegrain. It won’t be complicated to use for you as you are a professional. The cassegrain also offers a planetary experience that’s way better than the dobsonian. 

So, we hope you’re clear on which one you want to buy. However, no matter which one you end up buying, make sure to properly care for your telescopes


Question: Is it possible to see planets through a Dobsonian telescope? 

Answer: Low-cost Dobsonian telescopes will provide excellent views of planets in our Solar System. It will also give views of star clusters, nebulae, and deep-sky objects.

Question: Is Cassegrain a reflector telescope?

Answer: Yes, cassegrain is a reflector telescope. This design incorporates a primary concave mirror as well as a secondary convex mirror.

Question: What is known as a Cassegrain objective?

Answer: A concave primary mirror and a convex secondary mirror make up a cassegrain objective. The primary mirror is where the system stop is positioned. 


Now you know the differences between dobsonian and cassegrain. So, we hope it’s easier for you to make your decision. 

However, we don’t want you to make this decision based on just our words. We want you to try both these telescopes before making a decision.  

We wish you all the luck.

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