Telescope

A telescope comprising:

• deviation amount calculating means for calculating a deviation amount of an optical system from a position where an object image is observed under an in-focus condition constituting the telescope;
• optical system driving means for driving the optical system;
• and
• driving amount calculating means for calculating a driving amount, of the driving means, to a position where the in-focus condition is obtained based on a deviation amount calculated by the deviation amount calculating means;
• wherein said optical system driving means drives the optical system by a driving amount calculated by said optical system driving amount calculating means in a shorter time than a time required for accommodating a human eye until the object image is observed under the in-focus condition.

A telescope comprising:

• a viewing optical system constituting the telescope;
• focus condition detecting means having an objective lens for receiving a light coming from an object, and generating an electrical signal corresponding to an image shift amount of the object based on the light received through the objective lens;
• optical system driving amount calculating means for calculating a driving amount, of the viewing optical system, to an in-focus position where an object image formed by said viewing optical system can be observed under the in-focus condition based on an output by the focus condition detecting means;
• and
• optical system driving means comprising a stepping motor for driving the viewing optical system based on an output by the optical system driving amount calculating means.

A telescope for observing objects at a near distance and a far distance, comprising:

• focus condition detecting means for detecting a focus condition of an optical system constituting the telescope;
• calculating means for calculating a direction and an amount to be moved of the optical system to an in-focus position where an object image is observed under the in-focus condition according to a result of a focus condition detection;
• optical system driving means for driving the optical system with an output by the calculating means;
• and
• inhibiting means for inhibiting a driving of the optical system when the calculated direction to be moved is toward a near distance and the calculated amount exceeds a predetermined amount.

A binocular system for permitting an observer to view objects from a near position to a far position with his or her eyes, comprising:

• an optical system having movable lens components for providing an image of an object;
• a focus detecting means for determining a focus condition of the object in the optical system;
• driving means for driving the movable lens components in response to the focus detecting means to focus the optical system image for the observer;
• and
• discriminating means discriminating whether the focus condition is within a predetermined in-focus range relative to a focusing ability of the observer's eyes and adjusting the driving of the driving means accordingly.