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MICRO MEASURING

     Next page                                          

 

 

                                                                

 

Field of view (FOV) with microscope

Relative Magnification

  

 

Is the diameter of view that you see

Is the magnification relative to the components.

  

 

when looking into a microscope. Typically you will see :

Objective 10x with 10x eyepiece and numeric zoom 2x

  

 

 

will produce a relative magnification of 200x.

  

 

 9.000

mm

 or 9000

μm

 at

20x

                  

 

 4.500

mm

 or 4500

μm

 at

40x

              

True Magnification   (Actual FOV  or  HFOV)

  

 

 1.800

mm

 or 1800

μm

 at

100x

              

If the actual FOV is 960 μm instead of 900 μm

  

 

 0.900

mm

 or 900

μm

 at

200x

              

The True magnification will be :

  

 

 0.450

mm

 or 450

μm

 at

400x

              

(180 / 960) x 1000 =   187.5x  instead of  200x

  

 

 0.180

mm

 or 180

μm

 at

1000x

                  

 

 

                                

HFOV will be used in this site instead of Actual FOV.

  

 

 180

μm

 or 0.180

mm

 is typically the FOV at 1000x

We will consider the horizontal FOV on each

 

 

    1

μm

 or 0.001

mm

 is called micron or micrometer

horizontal typical image of  800 x 600 pixels.

  
         

 Micrometer : one millonth of a meter.

The HFOV will be compare to the FOV diameter

  

 

 

                                

you will see at microscope for a final mesurement.

  

 

 Field of view (FOV) with telescope

    

 

 Is the maximum view angle of a lens.

See the example on the next page   --->

  

 

 The number supplied by a manufacturer is the Apparent FOV.

   

 

 The True FOV (or Actual FOV) is found by :

    

 

  dividing the Apparent FOV by the magnification.