2
2
D
C
016
,
0
]
mm
[
Size
Sensor
+
⋅
=
ct in mm
: Object size in mm
f horizontal pixels
Example:
C: Number of horizontal pixels = 256
: Number of vertical pixels = 256
: Distance from lens to object = 300 mm
hen a lens with focal length of 15 mm has to be used, and the object size
as to be kept at 100 mm, the distance from lens to object has to be
changed as follows:
of
e new distance from lens to object is calculated as:
5
⋅
(1 + (100 : 5.6)) = 282 mm
]
[
1
Sensor
+
]
[
mm
Size
B
A
mm
Length
Focal
=
A: Distance from lens to obje
B
C: Number o
D: Number of vertical pixels
D
6
.
5
256
256
016
,
0
]
mm
[
Size
Sensor
2
2
=
+
⋅
=
A
B: Object size = 100 mm
calculated focal length = (300 : (1 + (100 : 5.6))) = 16 mm
w
h
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
⋅
=
Size
Sensor
Size
Object
Length
Focal
mm
Object
to
Distance
1
]
[
at a focal length of 15mm, an object size of 100mm and a sensor size
5.6mm th
1
The distance from lens to object has to be increased from 300mm to
282mm.
CR Series
Ref. 1830-SU-02-G
Page 53
