Compact angle finder with adjustable magnifying lens system

Claim 1

A compact angle finder for single-lens reflex cameras comprising a single-lens reflex camera and an angle finder arranged at the rear of an eyepiece of said single-lens reflex camera and consisting of a Galilean type rotatably adjustable magnifying lens system, an objective lens system divided into two positive components bounding an air space therebetween, a reflecting member disposed in said air space, and an eyepiece lens system composed of two positive components, both said objective lens system and said eyepiece lens system being arranged at the rear of said magnifying lens system, and in which an entrance pupil of said adjustable magnifying lens system substantially coincides with an exit pupil of said eyepiece of the single-lens reflex camera finder, an exit pupil of said adjustable magnifying lens system is located within a range which is about one-half the overall length of said adjustable magnifying lens system from the center of rotation thereof and at the same time said exit pupil coincides with an entrance pupil of a lens system consisting of said objective lens system and said eyepiece lens system.