Optronis CamRecord CR Series, Руководство пользователя

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CR Series Ref. 1830-SU-02-N Page 85
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 = 256
D: Number of vertical pixels = 256
A: Distance from lens to object = 300 mm
B: Object size = 100 mm
calculated focal length = (300 : (1 + (100 : 5.6))) = 16 mm
when a lens with focal length of 15 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 15mm, an object size of 100mm and a sensor size of
5.6mm the new distance from lens to object is calculated as:
15
⋅
(1 + (100 : 5.6)) = 282 mm
The distance from lens to object has to be increased from 300mm to
282mm.
] [
1
] [
mm Size Sensor
B
A
mm Length Focal
+
=
2 2
D C 016 , 0 ] mm [ Size Sensor
+ ⋅ =
6 . 5 256 256 016 , 0 ] mm [ Size Sensor
2 2
= + ⋅ =






+ ⋅ =
Size Sensor
Size Object
Length Focal mm Object to Distance 1 ] [