Olympus CHA-P Manuel d'instruction - Page 15
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VI.
OPTICAL DATA
Objective || Magnification
PO4X
PO10X
PO20X |
PO40x | *PO100X
Ν.Α.
0.10
0.25
0.40
0.65
1.30
W. D. (mm)
18.77
6.78
1.58
0.61
0.11
Focal length (mm)
28.45
16.08
8.13
4.33
181
Resolving power ()
3.4
13
0.84
0.52
0.26
(Spring
(Spring
Eyepiece
loaded) |
loaded)
csx
Total magnification
20x
50X
100X
200X
500X
(Field
Focal depth (u)
300.0
48.0
15.56
4.99
1.05
number 21) | Field of view (mm)
5.25
21
1.05
0.53
0.21
Total magnification
40x
100X
200X
400X
1,000X
pos
Focal depth (u)
172.5
27.60
9.19
3.03
0.66
Field of view (mm)
45
18
09
0.45
018
Immersion objective.
Resolving power is obtained when the objective is used at full aperture
diaphragm.
The eyepieces K5X and WF10X
incorporate a sliding eye shield. This shield can be pulled
out to prevent glare and loss of contrast caused by ambient light hitting the eye.
O
W.D. (Working distance):
The distance between the specimen or cover glass and the nearest point of the objective.
O
N.A. (Numerical aperture):
The
numerical
aperture
represents a performance
number which could be compared
to
the relative aperture (f-number)
of a camera lens. N.A. values can be used for directly
comparing the resolving powers of all types of objectives. The larger N.A., the higher the
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.
©
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.