MEASURING INSTRUMENTS CATALOG No.E2016
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J-32JMitutoyo operates a policy of continuous improvement that aims to provide the customer with the benet of the latest technological advances.Therefore the company reserves the right to change any or all aspects of any product specication without notice.■ MagnicationThe ratio of the size of a magnied object image created by an optical system to that of the object. Magnication commonly refers to lateral magnication although it can mean lateral, vertical, or angular magnication.■ Principal RayA ray considered to be emitted from an object point off the optical axis and passing through the center of an aperture diaphragm in a lens system.■ Aperture DiaphragmAn adjustable circular aperture which controls the amount of light passing through a lens system. It is also referred to as an aperture stop and its size affects image brightness and depth of focus.■ Field StopA stop which controls the eld of view in an optical instrument.■ Telecentric SystemAn optical system where the light rays are parallel to the optical axis in object and/or image space. This means that magnication is nearly constant over a range of working distances, therefore almost eliminating perspective error.■ Erect ImageAn image in which the orientations of left, right, top, bottom and moving directions are the same as those of a workpiece on the workstage.■ Field number (FN), real eld of view, and monitor display magnicationunit: mmThe observation range of the sample surface is determined by the diam-eter of the eyepiece’s eld stop. The value of this diameter in millimeters is called the eld number (FN). In contrast, the real eld of view is the range on the workpiece surface when actually magnied and observed with the objective lens.The real eld of view can be calculated with the following formula:(1) The range of the workpiece that can be observed with the microscope (diameter)Real eld of view = FN of eyepieceObjective lens magnicationExample: The real eld of view of a 1X lens is 24 = 24 1The real eld of view of a 10X lens is 2.4 = 24 10(2) Monitor observation rangeMonitor observation range =The size of the camera image sensor (diagonal length) Objective lens magnication• Size of image sensor FormatDiagonal lengthLengthHeight1/3” 6.04.83.61/2” 8.06.44.82/3”11.08.86.6(3) Monitor display magnicationMonitor display magnication = Objective lens magnication xDisplay diagonal length on the monitorDiagonal length of camera image sensor

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