Olympus CX23 Anleitung Handbuch - Seite 18
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Useful Information
How to track a microscopic image
Total magnification
The size of the specimen image for observation is obtained by multiplying the eyepiece magnification by the objective
magnification. This value is referred to as total magnification.
Example: Eyepiece (10X) x Objective (40X) = 400X
Resolution
Resolution represents how finely a lens is able to distinguish the details of a specimen.
Resolution is mainly determined by the ability of the objective and scarcely related to that of the eyepieces. The function
of the eyepieces is to just magnify an image already resolved by the objective.
In case total magnifications are the same, better resolution is obtained with the combinations which have higher
magnification of objective.
Field number (FN)
The field number is the diameter of the image observed through an eyepiece, indicated in millimeters.
Eyepiece 10X : 20 mm WHSZ15X-H:16 mm
Actual field of view
The actual field of view is the size of the specimen actually
observed in the microscope. This makes it possible to find out
approximate size of the specimen.
Actual field of view = Field number/Objective magnification
When the eyepiece field number 20 and the objective
magnification 10X are used, the actual field of view is equal to:
Actual field of view = 20/10 = 2.0 mm
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To track an image
moving leftwards
(or to move the
specimen image
rightwards):
Direction of moving the image
To move the
specimen image
upward:
} The image observed through the microscope moves in directions
opposite to the actual up-down and left-right movements of the
specimen.
Move the slide
glass to the
left.
Move the slide
glass down.
Actual field of
view: 2.0 mm
Approx. 1.0 mm,
about half of actual
field of view.