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Celestron FirstScope Telescope has a 76 mm reflector optical tube. It makes FirstScope an ideal entry level astronomical telescope. The portable and lightweight table-top design makes it easy to store, transport and setup your FirstScope Telescope. It is very easy to observe with, the user simply navigates the night sky by moving the tube in the direction of their desired object.
Stylish design makes Celestron FirstScope Telescope a delightful keepsake for anyone interested in astronomy. The compact design makes it easy enough to take with you on your next outdoor adventure. FirstScope is also stylish enough to be a decorative fixture on your bookshelf or desk.
It has 76 mm aperture. Aperture (the diameter of the lens or mirror) is the single most significant factor determining the performance of a telescope. The bigger the aperture, the more light your scope gathers and the higher resolution (ability to see fine detail) it has. The clear aperture of a telescope is the diameter of the objective lens or primary mirror, specified in either inches or millimetres. Doubling the aperture means doubling resolution and quadrupling light gathering power. This means that an 8-inch scope can see things that are only one-fourth as bright as the limit of a 4-inch scope and details that are only half as big as the best that the smaller scope can resolve.
The Focal Length is 300 mm. A focal length is the distance from a telescopeâ€™s objective element (lens or primary mirror) to the point where rays of light from the objective converge to a focus. It is measured in inches or millimetres. Longer focal lengths will have more capacity for high magnification but thinner fields of view than shorter focal lengths. For example, a telescope with a focal length of 2000mm has twice the power and half the field of view of a 1000mm telescope when using the same eyepiece.
It has 180 x magnification. This value is highest useful magnification allowed by this optical system. Magnification of a telescope is essentially a relationship between two independent optical systems â€“ the telescope itself and the eyepiece you are using. To determine power, divide the focal length of the telescope (in mm) by the focal length of the eyepiece (in mm). By exchanging an eyepiece of one focal length for another, you can increase or decrease the power of the telescope. For example, a 25mm eyepiece used on a 1250mm focal-length telescope would yield a power of 50x (1250/25 = 50) and a 10mm eyepiece used on the same instrument would yield a power of 125x (1250/10 = 125). Since eyepieces are interchangeable, a telescope can be used at a variety of powers.
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