Olympus CX41 Instructions Manual - Page 23
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OPTICAL CHARACTERISTICS
The following table shows the optical characteristics of
combinations of eyepieces and objectives. The figure
on the right shows the performance data engraved on
the objectives.
Characteristics
Magnification
Objective
Plan CN
Plan Achromat
(FN 22)
*Field numbers
· With the U-CBI30-2/U-CTR30-2, the field number is 20 when the WHB10X eyepieces are used. The actual field is indicated by
the figure before ( ).
· With the U-CTBI, the field number is 18 when the provided dedicated 10X eyepieces are used. The actual field is indicated by
the figure inside ( ).
Glossary
Working distance (W.D.):
The distance from the cover glass surface to the nearest point of the objective.
Numerical aperture (N.A.):
The N.A. value represents a performance number which can be compared to the relative
aperture (f-number) of a camera lens. The higher N.A., the higher the resolving power.
Resolving power:
The ability to differentiate two points, i.e., the minimum distance by which the objects must be
separated in order to be revealed as two separate objects.
Focal depth:
The depth in the image through which the focused image will appear uniformly sharp. As the
aperture iris diaphragm is stopped down, the focal depth becomes greater. The greater the N.A. of an
objective, the shorter the focal depth.
Field number:
A number that represents the diameter in mm of the image of the field diaphragm that is formed by
the lens in front of it.
Field of view diameter:
The actual size of the field of view in millimeters.
Total magnification:
Equals the objective magnification multiplied by the eyepiece magnification.
W.D.
N.A.
(mm)
4X
0.10
18.5
10X
0.25
10.6
40X
0.65
0.6
100X
O
1.25
0.13
Cover
Resolution
Glass
(µm)
Thickness
Total Mag.
–
3.36
40X
–
1.34
100X
0.17
0.52
400X
–
0.27
1000X
Eyepieces
10X (FN*)
Remark
Depth of
Field
Focus
of
(µm)
View
175.0
5.0(4.5 )
28.0
2.0(1.8 )
3.04
0.5(0.45)
0.69
0.2(0.18)
(optional)
CX41
20