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 Magnification                                                            Field Number (FN), Real Field of View, and	
                                                                             Monitor Display Magnification	
The ratio of the size of a magnified object image created by an                                                                                              unit: mm
optical system to that of the object. Magnification commonly refers to
lateral magnification although it can mean lateral, vertical, or angular  The observation range of the sample surface is determined by the
magnification.                                                            diameter of the eyepiece’s field stop. The value of this diameter in
                                                                          millimetres is called the field number (FN). In contrast, the real field of
 Principal Ray                                                           view is the range on the workpiece surface when actually magnified
                                                                          and observed with the objective lens.
A ray considered to be emitted from an object point off the optical       The real field of view can be calculated with the following formula:
axis and passing through the centre of an aperture diaphragm in a
lens system.                                                              (1) The range of the workpiece that can be observed with the	
                                                                              microscope (diameter)
 Aperture Diaphragm
                                                                          	Real  field  of  view  =  	 FN         of eyepiece
An adjustable circular aperture which controls the amount of light                                   Objective    lens magnification
passing through a lens system. It is also referred to as an aperture
stop and its size affects image brightness and depth of focus.            E	xam	ple: 	The   real  field  of  view       of  a  1X lens is 24 =  =	 21	42140
                                                                          			The            real  field  of  view       of  a  10X lens is 2.4
 Field Stop
                                                                          (2) Monitor observation range
A stop which controls the field of view in an optical instrument.
                                                                          	Monitor  observation   range  =	  The  size  of the camera image sensor(diagonal  length)
 Telecentric System                                                                                                    Objective lens magnification

An optical system where the light rays are parallel to the optical        Size of image sensor	
axis in object and/or image space. This means that magnification is
nearly constant over a range of working distances, therefore almost              Format           Diagonal length              Length           Height
eliminating perspective error.                                                                           6.0                    4.8              3.6
                                                                                  1/ 3”                 8.0                    6.4              4.8
 Erect Image                                                                     1/ 2”                 11.0                     8.8              6.6
                                                                                  2/3”
An image in which the orientations of left, right, top, bottom and
moving directions are the same as those of a workpiece on the             (3) Monitor display magnification
workstage.
                                                                          Monitor display magnification =

                                                                          	  Objective      lens  magnification         x	  Display diagonal length on the monitor
                                                                                                                            Diagonal length of camera image sensor

                                                                                                                                                                       J

                                                                                                         J-30

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