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finderA low-power telescope with a wide field of view that has its optical axis aligned with that of the main telescope. It is used to locate an object to be observed and facilitate the training of the main telescope on that object. Because the field of view of the average amateur astronomer's telescope used at its lowest power is only about half a degree, some means of pointing it in the correct direction is needed. Setting circles enable this to be done with a permanent equatorial mounting but for a portable or a simple altazimuth mounting a finder is essential. It should have a field of view of at least four to eight degrees and be provided with illuminated cross wires or a graticule.
in astronomy, an auxiliary wide-angle tube immovably attached to a larger telescope and used to locate a celestial object and fix the larger telescope on it. The optic axes of the finder and the telescope are parallel; the cross hairs are placed in the finder’s field of view for more precise aiming of the telescope.