Telescopes – Glossary
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Telescopes and Eyepieces
Introduction With the purchase of a telescope, you also purchase the eyepiece that comes with it. And if you still…
Rayleigh and Dawes resolution
Resolving power (or resolution) of an optical telescope is the ability to see small details in the image. It is…
Barlow lens
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 One of the essential features of a telescope is its aperture. Depending on the type of telescope, the aperture…
Lowest and highest useful magnification
Magnification is the ability of a telescope to magnify an object. A lot of observers, not only beginners, don’t understand…
Light gathering power
The light gathering power (also light grasp) is an ability of a telescope to collect more light than the human…
Limiting magnitude – calculations
In astronomy, the magnitude refers to a logarithmic measure of the brightness of a celestial body. The larger the magnitude…
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