Olympus CX41 - Optical Characteristics

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CX41
OPTICAL CHARACTERISTICS
66
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 Eyepieces
Magnification N.A.
W.D.
(mm)
Cover
Glass
Thickness
Resolution
(µm)
10X (FN*)
Remark
Objective
Total Mag.
Depth of
Focus
(µm)
Field
of
View
Plan CN
Plan Achromat
(FN 22)
4X
10X
40X
100X
0.10
0.25
0.65
1.25
18.5
10.6
0.6
0.13
–
–
0.17
–
3.36
1.34
0.52
0.27
40X
100X
400X
1000X
175.0
28.0
3.04
0.69
5.0(4.5 )
2.0(1.8 )
0.5(0.45)
0.2(0.18) (optional)
Glossary
Working distance (W.D.):
Numerical aperture (N.A.):
Resolving power:
Focal depth:
Field number:
Field of view diameter:
Total magnification:
The distance from the cover glass surface to the nearest point of the objective.
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.
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.
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.
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.
The actual size of the field of view in millimeters.
Equals the objective magnification multiplied by the eyepiece magnification.
O
*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 ( ).