Olympus BHA-P Manual de instrucciones - Página 17
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VII. OPTICAL DATA
Immersion objective. Resolving power i s obtained when the objective i s used at the full
aperture diaphragm.
The eyepieces
K5X
and WFlOX incorporate a sliding eye shield. This eye shield can be
pulled out to prevent glare and loss o f contrast caused b y arnbient light hitting the eye lens.
0
W.D. (Working distance):
The distance between the specimen orcover- glass and the nearest point of the objective.
PO20X
0.40
1.58
8.1 3
0.84
1 O O X
15.56
1.05
200X
9.19
0.9
Objective
Magnification
-
N.A.
W.D.
i m m l
Focal length (mrn)
--
Resolving power
(
P
)
0
N.A. (Numerical aperture):
The n ~ ~ m e r i c a l aperture represents a perforrnance number whlch cocrld he compared to
the relative aperture (f-number) of a camera lens. N.A. values can be usecl for directly
comparing the resolving powers of all types of objectives. The larger
N.A..
the higher the
resolving power.
P04X
0.1 0
18.77
28.45
3.4
20X
300.0
5.25
40X
172.5
4.5
K5X
[
r : :
b e r
2 1
)
WFlOX
1 1 81
-
0
Resolving power:
The abllily of a lens to register small details. The resolving power of a lens
I S
measured by
its ability to separate two points.
P040X
0.65
0.6 1
4.33
0.52
(Spring
loaded)
200X
4.99
0.53
400X
3.03
0.45
POlOX
0.25
6.78
16.08
-
'
1.3
50X
48.0
2.1
1 OOX
27.60
1.8
Total magnification
Focal depth
(
I * )
)ecW(mm)-
f otal magnification
Focal depth
( , U
Field o f view ( m m )
0
Focal depth:
The disrance between the upper and lower limits o f sharpness in the image formed by an
optical system.
A
POlOOX
1.30
0.1
1
1.81
. -
0.26
(Spring
loaded)
500X
1.05
- -
0.21
1,OOOX
0.66
0.18
0
Field number:
t
A number that repl-esents the diameter in
lnln
of the image of the field diapliragnl that is
formed bv the lens
~ r i
front o f it.
0
Field of view diameter:
the actual s i x of the field of view in mnl.
9