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The universal microscope condenser of claim 1, wherein the first lens member moves along an arcuate path which intersects the optical axis of the fixed lens and the second lens member moves along a path, the projection line of which onto the plane of movement of the first movable lens member is tangent to the arcuate path of the first lens member when the first lens member is aligned with the optical axis of the fixed lens.ģ. Means acting upon said pivot arm and said carrier slide for moving said first and second lens members into and out of optical alignment with the fixed lens to vary the aperture and luminous field of the microscope condenser andĪ variable aperture stop disposed between the first and second movable lens members.Ģ. A universal microscope condenser comprising:Ī fixed lens mounted on the supporting member to provide a fixed optical axis Ī pivot arm pivoted to said supporting member about an axis parallel to the optical axis Ī first movable lens member mounted on said pivot arm for movement by said pivot arm into optical alignment with said fixed lens, said first lens member thereby being movable in a plane perpendicular to the optical axis Ī carrier slide mounted movably on said supporting member for movement in a plane generally aligned with the optical axis Ī second movable lens member mounted on said carrier slide