Olympus BHTP Series Instruction Manual - Page 19
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VI. OPTICAL DATA
Objectiw
T Y Pa
WDAch.
Magnification
4X
10X
20X
40X
IOOX
N.A,
0 . 1
0 . 2 5
0.4
0.85
1 . 3
W.D.
(mm)
18.23
7.18
3
.
0.6
0.18
Focal tength
(mm)
3 0 . 0 0
f
6 . 9
8.83
4.58
1,02
Eyepiece
Resolving power
(A
3.36
1.34
0.84
0.52
0.26
Total magnification
40X
lOOX
200X
400X
IOOOX
WHKlOX
Focal depth
(F)
172.5
27.6
9.14
3 . 0
0.65
(Field number
20) Field of ; i e w dia-
5
2
1
0.5
0.3
meter (mm)
Objectiw
TYPE
W
D
Plan
Magnification
4X
I O X
20X
40X
lOOX
N A
0 . 1
0 . 2 5
0 . 4
0 . 6 5
1.25
W.D. (mm)
7.03
7.4
0.83
0.23
0.17
Focal
length (rnm)
3 4 . 2 3
17.5
8.99
4.67
1.75
Eyepiece
Rmlvlng
p w e r
(PI
3.36
1.34
0.84
0.52
0.27
Total
r n a g n i t i c a t i o n
40X
lOOX
2WX
400X
1000X
WHKlOX
Focal
depth
(p)
172.5
2 7 . 6
9-14
3.0
0.68
( F i e l d
number
20) meld
of vienr dia-
5
2
1
0.5
0.1
meter
(rnm)
Immenshn objective. H l g k d molvlng power t r obtalned when the
objective
Is
kmd
at
o r
near the hrll aperture diaphragm opening.
W.D. (WORKING DISTANCE):
1
Re
cfrstance
between the specimen or
m
r glass
and
the nearest point
of the objective.
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.
M.A.
values
can be
used
for directly comparing the resolving powers of all
types of objectives. The larger N.A., the better
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 lying close together in the
field of view.
FOCAL DEPTH:
The distance between the upper and lower limits
of
sharpness in
the
image formed
by an
optical system in the image space.
.
.
FIELD
NUMBER:
A number that represents
the diameter in rnm
of
the
image of
the
field
diaphragm that is formed by the tens in front of it.
FIELD
OF
VIEW DIAMETER:
The
actual
size of the field of view in mm.
n
FIELD DEPTH
The distance between the upper and lower limits of sharpness
of
focus in
the object space as fine adjustment knob is turned.
17