I have often heard beginner stargazers asking if they can use telescopes through a window. Now those who are just starting can get confused over this. So, I decided to tackle that confusion in this article.

Can a telescope be used through a window? Unfortunately, no, you can’t. Window glasses are not made for optical viewing purposes. They can seriously distort images and lower the quality. That’s why using any optical devices through a window is never recommended.

 Why Can’t You Use A Telescope Through A Window?

There are many reasons for that. But two of them stand out the most. Here are the main reasons why you can’t use a telescope through a window:

  1. The glass used in the telescope and the glass used in windows is not identical. There are vast differences in terms of quality. Window glasses are nowhere near in quality as optical glasses (used in telescopes, Finderscopes, binoculars, etc.). That’s why window glass can seriously distort the light coming through it and produce a low-quality image. As a result, no matter how expensive or good your telescope is, you’ll always get a poor-quality image.
  2. No matter where you live, there will always be a temperature difference between your room and the outside environment. We know that air flows from a warmer environment to a cooler environment. So, if you set your telescope beside a window, you can face a nasty air current outside your room. This air current can cause serious distortion to your telescope image.

Isn’t There Any Way To Use Telescope Through a Window?

As I have already told you, using a telescope through a window is not recommended. However, if you must, you can. But, the image quality will get degraded. So, that’s the sacrifice you’ll have to make.

  • First, you’ll have to close the window.
  • Set your telescope beside the window. Keep everything ready, and ensure your telescope is perfectly set up for viewing.
  • Remember, as you are viewing through a closed window, the window itself will now act as a lens. As the window glass has poorer quality than the lens used in the telescope, the window glass will ultimately determine the final quality of the image.
  • Now you need to point the telescope directly towards the object you want to observe. Unfortunately, many stargazers make a mistake pointing the telescope at an angle. Pointing the scope at an angle can produce a further distorted image than pointing straight.

This is how you can use a telescope through a window. However, I’ll always recommend setting your telescope in an open place and enjoying the night sky from there. If you are new to stargazing, I’ll highly urge you to go through an article I’ve written on telescope tips for beginners. It’ll surely help you a lot.

Final Words

So, I hope by now you know why you can’t use a telescope through a window. However, if you are a beginner and want to know more about using telescopes, read my other posts on the site.