CHANGEABLE MAGNIFICATION FINDER

摘要

PURPOSE: A changeable magnification finder is provided to secure the wide angle visibility with a small size and to maintain the whole fine aberration with a high magnification. CONSTITUTION: An object lens group(10) has positive refractive force by comprising a fixed first lens group(I) with negative refractive force, a movable second lens group(II) with negative refractive force, a movable third lens group(III) with positive refractive force and a fixed fourth lens group(IV) with positive refractive force. An eyepiece group(30) has positive refractive force. A prism throws an object image of the objective lens group straightly by locating between the objective lens group and the eyepiece group. Thereby, the wide angle visibility is secured and the fine aberration characteristic is maintained.