Olympus CX23 Instructions Manual - Page 23
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8
Optical characteristics
The following table shows the optical performances of
combinations of eyepieces and objectives.
The figure on the right shows the performances
indicated on the objectives.
Optical
performance
Magnifi-
cation
Objectives
Plan objective
(FN 20)
CX22PL100XO (option)
100XO
Glossary
Working distance (WD)
Number of aperture (NA)
Resolution
Focal depth
(Object side)
Field number (FN)
Actual field of view
Total power
(Total magnification)
Objective type (on the back side)
Plan objective
Nu-
Working
merical
distance
W.D.
aperture
(mm)
N.A.
4X
0.10
27.8
10X
0.25
8.0
40X
0.65
0.6
1.25
0.13
Distance between the top surface of the cover glass and the top of the objective when in
focus.
This value corresponds to the F-number* of the camera and is related to the resolution.
Resolution becomes higher when the NA becomes larger.
(*F-number : Value dividing the focal length of the lens by the effective number of aperture.
This is used as an index to represent the brightness of the lens.)
Ability of an objective for resolving adjacent two points in the image, which is expressed in
terms of the minimum distance between two points on the specimen surface.
The depth range of a specimen, in which focus is obtained. Stopping down the aperture
iris diaphragm increases the depth of focus. The depth of focus is decreased when the NA
of objective becomes larger.
The diameter of the image observed through an eyepiece, indicated in millimeters.
Diameter of the field of view, expressed as the size on the specimen surface.
Objective magnification x Eyepiece magnification.
Magnification
Mechanical tube
length
Color band
10X Eyepieces (FN 20)
Cover
glass
Resolution
Total
thickness
(µm)
magnifi-
(mm)
cation
-
3.36
40X
-
1.34
100X
0.17
0.52
400X
-
0.27
1000X
Meaning
Numerical aperture
Field number
Cover glass thickness
Depth of
Actual
Remark
focus
field of
(µm)
view
175.0
5.0
28.0
2.0
3.04
0.5
0.69
0.2
Oil immersed
CX23
19