Optronis CamRecord CR Series, User Manual

Page: 81 / 89

CR Series Ref. 1830-SU-02-N Page 79
A: Distance from lens to object in mm
B: Object size in mm
C: Number of horizontal pixels
D: Number of vertical pixels
Example:
C: Number of horizontal pixels = 1200
D: Number of vertical pixels = 1200
A: Distance from lens to object = 300 mm
B: Object size = 100 mm
calculated focal length = (300 : (1 + (100 : 13,6))) = 36 mm
when a lens with focal length of 35 mm has to be used, and the object size
has to be kept at 100 mm, the distance from lens to object has to be
changed as follows:
at a focal length of 35mm, an object size of 100mm and a sensor size of
15,4mm the new distance from lens to object is calculated as:
35
⋅
(1 + (100 : 13,6)) = 292 mm
The distance from lens to object has to be reduced from 300mm to
292mm.
Vice versa, when the distance from lens to object has to be reduced, the
focus of the lens will come to its limit. and the required magnification factor
] [
1
] [
mm Size Sensor
B
A
mm Length Focal
+
=
6 , 13 1200 1200 008 , 0 ] [
2 2
= + ⋅ =
mm Size Sensor






+ ⋅ =
Size Sensor
Size Object
Length Focal mm Object to Distance 1 ] [