A-A-54386
Three objectives shall be supplied with a quadruple 360 degree revolving nosepiece having a ball detent index. Dust plugs shall be included in the unused objective hole(s) of the nosepiece. The objectives furnished shall be 10X, 40X or 45X and 100X oil immersion planachromatics having numerical apertures of 0.25, 0.65 or 0.66 and 1.25 respectively. Each planachromatic objective shall have an image flatness over the entire field of view without any loss of sharpness or any loss of focus around the periphery of the field of view.
The objectives shall be color coded and marked for identification. In the nosepiece, the objectives shall be parfocal and parcentered so they are not affected by switching from one objective to another. The 40X, 45X and 100X objectives shall be retractable (i.e. spring loaded) when contact is made with a microscope slide or its cover slip. As an alternate to retractable objectives, the nosepiece assembly shall be retractable when an objective makes contact with a microscope slide or its cover slip.
The specimen stage shall accommodate microscope slides that include 25 by 75 mm and 50 by 75 mm sizes. The specimen stage shall include a slide holder that is detachable by releasing a thumbscrew hold. The slide holder shall be in the form of a finger assembly that can grasp the sides of a microscope slide instead of its corners. The finger assembly shall also be retractable to allow more space on the specimen stage for manual scanning of a microscope slide. The aperture width of the stage mount shall be not less than 25 mm. A right hand ungraduated mechanical stage, as a minimum, shall control the X-Y horizontal movement of the slide holder. The mechanical stage shall have ball bearing slideways in two perpendicular directions that can give complete coverage under an objective of both size microscope slides.
The substage condenser shall be located below the mechanical stage in a fork-type mount which is moved vertically by rack and pinion control for focusing purposes. The substage condenser shall have a numerical aperture (N.A.) of 1.25 or 1.30, and shall include an integral iris diaphragm and shall provide an even full field illumination and a variable aperture control for all the objectives, i.e. from 10X to 100X (oil immersion). The fork mount shall contain two knurled centering screws. The condenser shall be supported by a snap action in the fork-type mount. The condenser shall also be removable from the fork-type mount without having to remove the centering screws.
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