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Magazine > Information > Telescope information > The right telescope
Information

The right telescope

Aperture, resolution and magnification: the vital knowledge you need to successfully choose a telescope.

Teleskop Refraktor Sucher Berge Wiese

We will show you the differences between the different design types of telescope, and what that means for you. Too much of a good thing? Get going straight away with 5 questions to consider before buying a telescope, and find out more about the basics later.

Aperture
Aperture

One of the most important characteristics of a telescope, and what it means for your view of the stars.
Resolving power
Resolving power

What it means for observations and how to determine the resolution of a telescope with a simple formula.
Obstruction
Obstruction

A telescope should gather light - preferably lots of it. But there is also a downside that we have to live with ...
Magnification
Magnification

There are three important magnifications that every amateur astronomer can easily determine. Here we show you how you do this.
Exit pupil
Exit pupil

What is the connection between the exit pupil and the eye, and why is the age of the observer important?
Image defects
Image defects

Unfortunately, no telescope nor any other optical instrument is completely defect-free. Here we describe the most important image defects found in astronomical telescopes.