Abstract: Systems and techniques relating to a microscope with an adjustable stage are described. A microscope includes a base, a support arm attached to and extending upwardly from the base, a head attached to the support arm, the head including a lens, and an eyepiece attached to the head. A stage is releasably attachable to the support arm between the head and the base at multiple locations, providing multiple working distances between a lower surface of the head and an upper surface of the stage. When the stage is attached to the support arm at a location, a working distance between the lower surface of the head and the upper surface of the stage is further adjustable to an either greater or lesser working distance. In another embodiment, microscopic and macroscopic viewing can both be provided using a lens changer with multiple lens positioned radially about an axis of rotation.

Abstract: Systems and techniques relating to a microscope with an adjustable stage are described. A microscope includes a base, a support arm attached to and extending upwardly from the base, a head attached to the support arm, the head including a lens, and an eyepiece attached to the head. A stage is releasably attachable to the support arm between the head and the base at multiple locations, providing multiple working distances between a lower surface of the head and an upper surface of the stage. When the stage is attached to the support arm at a location, a working distance between the lower surface of the head and the upper surface of the stage is further adjustable to an either greater or lesser working distance. In another embodiment, microscopic and macroscopic viewing can both be provided using a lens changer with multiple lens positioned radially about an axis of rotation.

Abstract: An illuminator for a microscope contains a source of light and the microscope has a stage with an opening for upward passage of light from the light source to illuminate a specimen on the stage. The housing defines a window for passage of light from the source through the opening in the stage for illuminating the specimen. The housing also includes first and second support arms, and the housing is adjustable both horizontally and vertically, e.g. relative to the opening in the microscope stage.

Abstract: A microscope has a microscope stand with a specimen stage for viewing and a microscope tube mounted on the stand, the tube having an eyepiece at one end and an objective at the other end, adjacent the stage. The tube is constructed for axial adjustment to vary the position of the objective relative to a specimen on the stage, both by application of axially directed force for coarse focus adjustment and by application of rotational force for fine focus adjustment.

Abstract: A illuminator base for illumination of a microscope specimen from below the specimen includes a fluorescent lamp bulb for generation of illuminating light on a viewing axis. The fluorescent lamp bulb has at least two arms, each having an active volume within a glass wall. The arms are disposed with each active volume generally tangent to the viewing axis. A line intersecting the viewing axis and the axes of lamp arms lies at an acute angle to the viewing axis. Preferably the lamp bulb is u-shape, the angle is about 40.degree. and 50.degree., and light transmitted by the lamp arms along the viewing axis is substantially without shadow.

Abstract: A binocular viewing device including means for resiliently mounting a prism seat to the binocular body within an enclosed chamber consisting of at least three elongated fasteners spaced about the periphery of the prism seat, with means associated with each fastener for resiliently engaging a first surface of the prism seat to urge the prism seat into fixed contact with the body, and at least one adjusting member extending through the body into the chamber from the outside, the inner end of the adjusting member adapted upon rotation for axial movement relative to the body for engagement upon a second surface of the prism seat in a manner to displace the prism seat from contact with the body, thereby to change the relationship of the plane of the prism seat to the line of viewing from ocular lens to objective lens for changing alignment of the optical system.

Abstract: In binoculars including focusing means comprising an adjustable, rotatable focusing knob operatively associated with focus adjustment means, whereby rotation of the knob adjusts the focus adjustment means in a manner related to the distance between a viewer employing said binoculars and an object to be viewed, the improvement comprising first click-stop means operatively associated with the rotatable focusing knob, the click-stop means being effective to abruptly increase the force required to rotate the knob at a focus setting for a predetermined distance between the object to be viewed and the viewer.