Olympus BHS-653P Manuel d'instruction - Page 19
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VI.
OPTICAL DATA
Objective
\
Eyepiece
\
WHKlOX
(Field number
20)
Magnificat ion
W. D.
(mm)
Focal length (mm)
Resolving power (p)
Total magnification
Focal depth
(p)
Field of view dia-
f
meter (mm)
PO
D
Ach.
1 O O O X
+
WHKlOX
(Field number
20)
+
Magnification
Focal length (mm)
1
34.23
Focal depth
( p )
1
172.5
1
27.6
Resolving power (p)
3.36
Total magnification
40X
PO
D
Plan
1.34
1 O O X
20X
0.4
0.83
8.99
0.84
200X
9.1 4
*
Immersion objective. Resolving power is obtained when t h e objective is used a t t h e f u l l
aperture diaphragm.
Field of view dia-
meter (mm)
0 W.D. (Working distance):
T h e distance between the specimen o r cover glass and the nearest p o i n t o f the objective.
40X
0.65
0.23
4.67
0.52
400X
3.0
0
N.A. (Numerical aperture):
T h e numerical aperture represents a performance number w h i c h c o u l d b e compared t o
t h e relative aperture (f-number) o f a camera lens. N.A. values can be used f o r directly
comparing the resolving powers o f all types o f objectives. The larger N.A., t h e higher the
resolving power.
1 O O X
1.25
0.17
1.75
0.27
1 O O O X
0.68
5
0 Resolving power:
The ability o f a lens t o register small details. The resolving power o f a lens is measured
b y its a b i l i t y t o separate t w o points.
0 Focal depth:
T h e distance between t h e upper and lower limits o f sharpness in the image formed b y
an optical system.
2
0
Field number:
A number that represents t h q diameter i n m m o f the image of t h e field diaphragm that
is formed b y the lens i n f r o n t o f i t .
0 Field o f view diameter:
1
T h e actual size of the field of view i n m m .
0.5
0.1