Operating instructions

MC 80
DX
Carl Zeiss
B 40-036 e 03/99 2-25
Before, the length L in the specimen plane must be computed by the formula given below, for the
respective objective magnification and intermediate magnification. This formula already allows for
the length of the scaling bar in the 35 mm format (12.5 mm) and for the projection lens factor (2.5 ).
L
5000
VxV
m
obj
z
=() V
obj
= objective magnification
V
z
= intermediate magnification
(Optovar or zoom factor)
Example:
V
obj
= 40 ; V
z
= 1
L
5000
40 x 1
125 m==
The length of the scaling bar in the specimen plane is 125 µm. It can be entered as shown in the
illustrations below:
either
or
Table: Length L (µm) of the scaling bar in the specimen plane depending on the objective magnification V
obj
and the intermediate magnifaction V
z
V
obj
V
z
1 1,25 1,6 2 2,5
1,25 4000 µm 3200 µm 2500 µm 2000 µm 1600 µm
2,5 2000 µm 1600 µm 1250 µm 1000 µm 800 µm
4 1250 µm 1000 µm 781 µm 625 µm 500 µm
5 1000 µm 800 µm 625 µm 500 µm 400 µm
10 500 µm 400 µm 313 µm 250 µm 200 µm
20 250 µm 200 µm 156 µm 125 µm 100 µm
25 200 µm 160 µm 125 µm 100 µm 80 µm
32 156 µm 125 µm 98 µm 78 µm 63 µm
40 125 µm 100 µm 78 µm 63 µm 50 µm
50 100 µm 80 µm 63 µm 50 µm 40 µm
63 79 µm 63 µm 50 µm 40 µm 32 µm
100 50 µm 40 µm 31 µm 25 µm 20 µm
150 33 µm 27 µm 21 µm 17 µm 13 µm