Inner focus type telescope

Details Inner focus type telescope Inner focus type telescope

1997-06-20

1998-08-18

Henry, Jon W.

Optical: systems and elements

Compound lens system

Telescope

359431, 359556, 356375, G02B 2304, G01B 906, G01B 1114

Patent

active

057965170

ABSTRACT:
An inner focus type telescope includes a sighting objective lens, a focusing lens, a horizon compensating optical system, a focal plane, and an eyepiece through which an object image formed on the focal plane can be viewed, arranged in this order from the object side. The position of the focusing lens is adjustable to form the object image on the focal plane in accordance with the distance of an object to be viewed. The telescope further includes a beam splitting optical system provided in the optical path between the objective lens and the focal plane to split the optical path, a surface equivalent to the focal plane, provided in the beam splitting optical system, and a focus detecting system which detects the state of the focus at the equivalent surface.

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