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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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William Pirraglia |