7
OPTICAL
UATA
:
• D
Achromat
I
I
I
Objective Type o
Achromat
Magnifiction
4X
JOX
40X
100X'
N.A.
0.10 0.25 0.65
1.30
1,11/.0.
(mm)
18.23 7.18
0.63
0.20
--
Focal length (mm)
30.03
1690
4.58
166
--
Resolving
pO'.ver
(p) • •
3,4
1.3
0.52
0.26
Eyepiece
Remarks Spring-loaded
-
Total magndicalion 40X
WOX
400X 1000X
CWHK10X
Focal depth
(,u)
172.5 27.60 3.03 0.66
(Field number 18)
-
Field
of
view (rnm)
4.5 1.8
0.45 0.18
• E D
Achromat
Objective
Type
ED
Achromat
Magnification
4><
lOX 40X
100X'
N.A.
0.10 0.25
0.65
1.25
W.o.
(mm)
29.00 6.30 0.53
0.20
Focal length
(mm)
31.05 16.45 4.59
1.90
Rt"$Olving -power
(P)'.
3.4
1.3 0.52 0.26
Eyepiece
Remarks
Spr;ng-loaded
Total magnification
40X 100X 400X
l00<..,X
CWHK10X
Focal depth
(,u)
172.5
27.60 3.03 0.67
(Field number 18)
Field
of
view (mm)
4.5 1.8 0.45 0.18
"Immersion obiectives
"The
resolving power
is
obtained v-lith
L1le
fully
opened aperture diaphragm.
Glossary
Working distance:
Numerical aperture:
The distance
from
the specimen
or
cover
glass
to the nearest
point
of
the
objec-
tive.
The N.A. represents a performance number
which
could be compared
to
the
relative aperture (f-number)
of
a camera lens. The
quantity
of
light
which
the
objective receives
from
the object increases
with
the square
of
the performance
number.
Field number:
Focal
depth:
Resolving
power:
The resolving power
of
a lens
is
measured
by
its
ability
to separate
tvvo
points.
The distance between the upper and lower
limits
of
sharpness in the image
formed
by
an
optical system. As
you
stop
down
the aperture iris diaphragm,
the focal depth becomes deeper. The larger the
N.A.
of
the objective the
shallower the focal depth.
A number that represents the diameter in mm
of
the image
of
the field dia-
phragm that
is
formed
by
lens in fron t
of
it.
Field-of-vi8'N diameter: The actual size
of
the field
of
view in mm.
II
o
"'0
-l
()
»
r
o
~
»
Total
magnifiC<ltion.
Equals the objective magnification
multiplied
by
the eyepiece magnification.
----------------------------111
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