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Telescopes - Glossary

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Telescopes and Eyepieces

Telescopes and Eyepieces

BYMaruša JustinekFeb 23, 2021

Introduction With the purchase of a telescope, you also purchase the eyepiece that comes with it. And if you still…

Rayleigh and Dawes resolution

Rayleigh and Dawes resolution

BYMaja PahičDec 20, 2019

Resolving power (or resolution) of an optical telescope is the ability to see small details in the image. It is…

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Barlow lens

BYMaja PahičDec 10, 2019

Magnification of telescopes is calculated by dividing the objective focal length with the eyepiece focal length. To change the magnification,…

Aperture, focal length and focal ratio

Aperture, focal length and focal ratio

BYMaja PahičDec 10, 2019

Aperture One of the essential features of a telescope is its aperture. Depending on the type of telescope, the aperture…

Lowest and highest useful magnification

Lowest and highest useful magnification

BYMaja PahičDec 10, 2019

Magnification is the ability of a telescope to magnify an object. A lot of observers, not only beginners, don’t understand…

Light gathering power

Light gathering power

BYMaja PahičDec 10, 2019

The light gathering power (also light grasp) is an ability of a telescope to collect more light than the human…

Limiting magnitude - calculations

Limiting magnitude – calculations

BYMaja PahičDec 9, 2019

In astronomy, the magnitude refers to a logarithmic measure of the brightness of a celestial body. The larger the magnitude…