Erect type zoom telescopic optical system
AssigneeNippon Kogaku K.K.
InventorMakoto Uehara
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Abstract
This invention provides an erect type zoom telescopic optical system for a binocular or monocular telescope which consists of a positive lens group nearest to an object, a variator group, a compensator group, an image erect prism positioned between the variator and compensator groups, a field stop positioned at a predetermined definite position where the image of the object is formed by said compensator group movable along the optical axis interlocking with the variator group, and an eye-piece for observing the image of the object formed at the field stop. This invention provides a compact size system with high quality compensating aberrations.
Claims8
An erect type zoom telescopic optical system comprises:
- (a) a positive lens group positioned nearest to an object side and movable along the optical axis for focusing;
- (b) a variator group positioned next to the positive lens group and movable along the optical axis for varying magnification;
- (c) a compensator group positioned at the image side of the variator group and movable interlocking with the variator group along the optical axis for forming an image of the object at a predetermined definite position;
- (d) an image erecting prism member positioned between the variator group and the compensator group for erecting the image;
- (e) a field stop positioned at said definite position where the image of the object is formed;
- and
- (f) an eye-piece for observing the image of the object formed at said field stop.
Dependencies are inferred from the claim text.