VI. OPTICAL
DATA
Objective
Type
o
Achromat
o Plan
Ach.
Magnifi-
4X
lOX
40X
l00X'
4X
lOX
40X
100X'
cation
N.A.
0.10
0.25
0.65
1.30
0.10
0.25 0.65
1.25
W.O.
(mm)
18.2
7.2
0.6
0.20
7.03
7.4 0.27
0.17
Focal length
30.03
16.9
4.58
1.91
34.23
17.5
4.67
1.75
lmml
Eyepiece
Resolving
3.36
1.34
0.52
0.26
3.36
1.34
0.52
0.27
power (jJ)
WK10X
Total mag. 40X
100X
400X
1000X
40X
100X
400X
lQOOX
(Field
Focat
171.6
27.45
3.0
0.7
171.6
27.45
3.0
0.7
number
depth
{jJJ
201
Field
of
5 2
0.5
0.2
5
2
0.5
0.2
view
(mm)
ll-Immersion
objectives
The resolving power and focal depth
are obtained
witt'
fully
opened aperture diaphragm.
Technical
terms:
• Working distance:
The
distance
from
the
cover
glass
to
the
nearest
point
of
the
objective.
• Numerical aperture: The N.A. represents a performance number which
can
be
com-
pared to the relative aperture (f-number) of a camera lens.
Th~
N.A.
values can
be
used
for
directly
comparing
the
resolving
powers
of
all types
of
objectives. The larger the
NA.
the higher
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.
As
yo u stop down the
aperture
iris
diaphragm, the focal depth
becomes
larger. The
larger
the N.A.
of
an
objective the shallower
the
focal depth.
• 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
on
the object surface.
17
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