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Focal Length and Your Refractor Telescope

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What does focal length have to do with my selection of a refractor telescope?

Focal Length and Your Refractor Telescope

Aperture is one consideration when selecting your refractor telescope, but the details are in the focal length. For instance, if you are selecting a 60mm refractor telescope, you might find one has a focal length of 900mm and another with a focal length of 1000mm. If you want to see the details of a planet in the night sky, you should choose a refractor telescope with the longer focal length. A longer focal length will give you a larger, but dimmer image while a shorter focal length will give you a brighter, smaller image.

   

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