Converter for polar-axis telescope

Details Converter for polar-axis telescope Converter for polar-axis telescope

1997-04-09

1999-09-21

Spyrou, Cassandra

Optical: systems and elements

Compound lens system

Telescope

359399, 359421, G02B 2300

Patent

active

059561777

ABSTRACT:
A converter for a polar-axis telescope includes an optical system which varies one of the field of view, angle of field, and magnification of the polar-axis telescope. A movable lens barrel is provided which holds the optical system such that the optical system can be moved into or out of the optical path of the polar-axis telescope. The converter may be detachably attached to a front end of the polar-axis telescope, or may be built into the polar-axis telescope. The converter lens system has a negative power and includes a negative lens group and a positive lens group.

REFERENCES:
patent: 1094724 (1914-04-01), Konig
patent: 1553211 (1925-09-01), Barr et al.
patent: 3840284 (1974-10-01), Rand
patent: 4436421 (1984-03-01), Suzuki
patent: 5000556 (1991-03-01), Katsuma
patent: 5121220 (1992-06-01), Nakamoto
patent: 5589976 (1996-12-01), Kanai et al.

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