Olympus BHT Instrukcja obsługi - Strona 18
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VI. OPTICAL DATA
*
Immersion objectives
The resolving power and focal depth are obtained w i t h fully opened aperture diaphragm.
D Achromat
WHKlOX
(Field
number
Technical terms:
D
Plan
Ach.
Working distance:
The distance from the cover glass t o the nearest point of the
objective.
lOOX*
1.30
0.20
1.91
0.26
20)
Field of
view (mm)
2
Total
mag.
40X
100X
400X
Numerical aperture:
The N.A. represents a performance number which can be com-
pared t o the relative aperture (f-number) of a camera lens. The
N.A. values can be used for directly comparing the resolving
powers o f all types of objectives. The larger the N.A., the higher
resolving power.
4X
0.10
7.03
34.23
3.36
40X
0.65
0.6
4.58
0.52
Focal
depth
(PI
.
Resolving power:
Focal depth:
40X
0.65
0.27
4.67
0.52
1OX
0.25
7.4
17.5
1.34
10X
0.25
7.2
16.9
1.34
0.10
W.D. (mm)
18.2
Focal length 30.03
The ability o f a lens t o register small details. The resolving power
of a lens is measured b y its ability t o separate t w o points.
10OX1
1.25
0.17
1.75
0.27
Eyepiece
171.6
The distance between the upper and lower limits o f sharpness in
the image formed by an optical system. As you stop down the
aperture iris diaphragm, the focal depth becomes larger. The
larger the N.A. o f an objective the shallower the focal depth.
Field number:
A number that represents the diameter i n m m of the image o f
the field diaphragm that is formed b y the lens in front o f it.
Field o f view diameter:
The actual size of the field o f view in m m on the object surface.
Resolving
power
(fi)
27.45
3.36
3.0
0.7
171.6
27.45
3.0
0.7