Olympus BHTU Petunjuk Manual - Halaman 18

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Halaman Cetak
VI.
OPTICAL DATA
Objective
Type
o
Achromat
o
Plan Ach.
Magnifi-
4X
lOX
40X
l00X'
4X
lOX
40X
100X'
cation
N.A.
0.10
0.25
0.65
1.30
0.10
0.25
0.65
1.25
W.O. (mm)
18.2
7.2
0.6
0.20
7.03
7.4
0.27
0.17
Focal length
30.03
16.9
4.58
1.91
34.23
17.5
4.67
1.75
lmml
Eyepiece
Resolving
3.36
1.34
0.52
0.26
3.36
1.34
0.52
0.27
power (jJ)
WK10X
Total mag.
40X
100X
400X
1000X
40X
100X
400X
lQOOX
(Field
Focat
171.6
27.45
3.0
0.7
171.6
27.45
3.0
0.7
number
depth {jJJ
201
Field of
5
2
0.5
0.2
5
2
0.5
0.2
view (mm)
ll-Immersion objectives
The resolving power and focal depth are obtained witt' fully opened aperture diaphragm.
Technical terms:
•
Working distance:
The distance from the cover glass to the nearest point of the
objective.
•
Numerical aperture:
The N.A. represents a performance number which can be com-
pared to the relative aperture (f-number) of a camera lens.
Th~
N.A. values can be used for directly comparing the resolving
powers of all types of objectives. The larger the NA. the higher
resolving power.
•
Resolving power:
The ability of a lens to register small details. The resolving power
of a lens is measured by its ability to separate two points.
•
Focal depth:
The distance between the upper and lower limits of sharpness in
the image formed by an optical system. As yo u stop down the
aperture iris diaphragm, the focal depth becomes larger. The
larger the N.A. of an objective the shallower 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 mm on the object surface.
17