Magnifications / Fields Of View - Zeiss OPMI PRO magis Instructions For Use Manual

52

Magnifications / Fields of view

G-30-1292-en
Maintenance / Further information
If the magnification factor γ of the zoom system is known, you can calcu-
late the total magnification of the surgical microscope. The following
equation is used to determine the total magnification:
f
tube
---------- - γ M
M
=
T
f
obj
where:
f the focal length of the binocular tube
tube
f the focal length of the main objective lens
obj
γ
the magnification factor of the zoom system
M the magnification of the eyepiece
eye
Example:
f = 170 mm, f = 200 mm, γ = 1.6 and M
tube obj
The resulting total magnification is:
170 mm
M -------------------- - 1.6 12.5
=
T
200 mm
If the total magnification of the surgical microscope M
use the formula:
FoV
=
D
to calculate the field of view diameter FoV
The field of view diameter is the diameter of the circular surgical field
which can be seen through the eyepieces.
FoVN in the above formula stands for the field of view number of the eye-
piece.
By entering the value MT = 17.0 in the formula, we obtain the following
field of view diameter for 12.5x eyepieces with a field of view number
FoVN of 18 mm:
FoV
=
D
OPMI® PRO magis Surgical Microscope
⋅ ⋅
eye
eye
⋅ ⋅
17.0
=
⋅
FoVN M
eye
---------------------------------
M
T
of the surgical microscope.
D
⋅
18 mm 12.5
--------------------------------- -
13.2 mm
=
17.0
= 12.5 x.
is known, you can
T
Issue 3.0
Printed on 30. 07. 2001