Patent ID: 6717739
Filing Date: 2004-04-06
Classification: G02B

Abstract:
An objective (2) for stereomicroscopes of the telescope type which comprises three optical assemblies (G1, G2, G3), the first assembly (G1) being arranged towards the object side and the third assembly (G3) being arranged towards a magnification changer (3L, 3R), wherein the following conditions are met: 0.44&leq;ENPF&leq;0.6andtan(w1)&gE;0.16, whereENP denotes the diameter of the entry pupil of the magnification changer (3L, 3R) at the maximum magnification, F denotes the focal length of the objective (2) and w1 denotes the maximum field angle of the objective (2) at the lowest magnification of the magnification changer (3L, 3R).