| Angle of View (Formula
for Calculation) Formula for calculation
Examples
a) In case of vertical size
b) In case of horizontal size
Formula
for calculation
It is important to know the angle of view of the lens to
take in the object. Angle of view changes with focal length of lens and image size
of camera. The focal length to cover the object can be calculated from the next
formula.
f : focal length of lens
V: Vertical size of object
H: Horizontal size of object
D: Distance from lens to object
v : vertical size of image (see the following table)
h : horizontal size of image (See the following table)
| Format |
1 inch |
2/3 inch |
1/2 inch |
1/3 inch |
| v |
9.6mm |
6.6mm |
4.8mm |
3.6mm |
| h |
12.8mm |
8.8mm |
6.4mm |
4.8mm |
Examples
a)
In case of vertical size
1/2 inch camera
Vertical size of object
Distance from lens to object
substitute these data to formula (1)
v=4.8mm
V=330mm D=2500mm
b)
In case of horizontal size
1/2 inch camera
Horizontal size of object
Distance from lens to object
substitute these data to formula (2)
h=6.4mm
H=440mm D=2500mm
|
