Telescope guider

Details Telescope guider Telescope guider

1981-10-01

1984-05-15

Henry, Jon W.

350557, 350247, 350172, G02B 2304, G02B 2316, G02B 2710

Patent

active

044485000

ABSTRACT:
Apparatus is disclosed for guiding a telescope during long-exposure astronomical photography. A reflecting prism or mirror is inserted into the peripheral portion of the optical field in front of the camera. The reflected light is observed through an eyepiece with cross-hairs, allowing the observer to focus the eyepiece on a particular guide star in the image field and adjust the telescope during the exposure to track the apparent motion of the object. The reflecting element is over half the diameter of the optical field in length, providing substantial improvement in light collection. The reflecting element may be rotationally adjusted around the optic axis for guide star selection. Further, the eyepiece position may be adjusted in a direction perpendicular to the eyepiece axis and in the plane of the optic axis, to provide for radial selection of the guide star in the optical field. A filter compartment behind the reflecting element is further provided.

REFERENCES:
patent: 991652 (1911-05-01), Saegmuller
patent: 2628529 (1953-02-01), Braymer
patent: 2948189 (1960-08-01), Fischer
patent: 3614449 (1971-10-01), Ward
patent: 3898678 (1975-08-01), Walworth
patent: 3900858 (1975-08-01), McCann et al.
patent: 4283112 (1981-08-01), Venable
The enclosed brochure published by Celestron describes an off-axis _ guiding system. The present invention is an improvement over _ the Celestron guider. The present invention provides (1) an improved _ light collecting prism design such that more light is collected _ without degradation of the main image, and (2) an adjustable ocular _ which permits greater flexibility in guide-star selection. It is believed that the Celestron off-axis guider is not patented.

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