Longfocal length telescope

What is a shortfocal length telescope

One type of lens is the convex lens (also known as a converging lens) which is cut to have its curves face outwards. The light going through a convex lens is ...

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Focal length telescopefor astrophotography

As evidenced by the wide array of books about astronomy aimed at beginners and amateurs it is clear to see that this a field of science in which nonprofessionals can easily partake. All that is needed is an astronomical telescope and the sky is the limit. An astronomical telescope is a device used by astronomers to examine planets, stars, and other heavenly bodies. The telescope can magnify these distant objects or produce images that are otherwise too faint for the naked eye to see. There is no standard telescope used by all astronomers but rather an assortment of designs to choose from.

2000mmfocal length telescope

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An eyepiece (essentially a magnifying glass) is also needed in an astronomical telescope. It is used to bring the human eye closer to the image produced at the focal point and examine it. Astronomical eyepieces also have focal lengths, which vary from 0.004 m to 0.050 m depending on design.

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The Hubble Space Telescope, arguably the most famous telescope, has a focal length of roughly 58 M. This is longer than the space shuttle in which it is delivered into orbit but not a problem because a secondary mirror is used to reflect the light back through a hole in the main mirror. For comparison, a Newtonian reflector made by J.H. Hindle has a focal length of 2.860 m and a 10-inch (25.4 cm), f-9 telescope also has a focal length of 2.2860 m.

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The astronomical telescope is an instrument that works based on a relatively simple premise. A lens or mirror, known as the objective, collects light from an object and focuses it at a location called the focal point. The focal length is the distance from the focal point to the surface of the mirror or the center of the lens.

A magnifying glass is a convex lens that is used to produce a magnified image of an object. The lens is usually mounted in a frame with a handle.

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