A VARIABLE MAGNIFICATION FINDER

摘要

THE PRESENT INVENTION RELATES TO A VARIABLE MAGNIFICATION FINDER COMPRISING AN OBJECTIVE LENS GROUP HAVING A POSITIVE REFRACTIVE POWER FOR ENABLING A WIDE ANGLE VIEW OF AN OBJECT. THE OBJECTIVE LENS GROUP INCLUDES A FIRST LENS SUB-GROUP HAVING EITHER A NEGATIVE OR A POSITIVE REFRACTIVE POWER WITH RESPECT TO AN IMAGE OF THE OBJECT; A SECOND LENS SUB-GROUP HAVING A NEGATIVE REFRACTIVE POWER; A THIRD LENS SUB-GROUP HAVING A POSITIVE REFRACTIVE POWER AND HAVING A CEMENTED LENS WITH AT LEAST TWO PIECES; AND A FOURTH LENS SUB-GROUP HAVING A POSITIVE REFRACTIVE POWER. THE THIRD LENS SUB-GROUP IS MOVABLE FOR MAGNIFYING THE IMAGE, AND THE SECOND LENS SUB-GROUP IS MOVABLE FOR COMPENSATING THE DIOPTER OF THE MAGNIFIED IMAGE. THE FINDER FURTHER COMPRISES AN EYEPIECE LENS GROUP HAVING A POSITIVE REFRACTIVE POWER FOR VIEWING THE IMAGE.