Visual angle is the most import for vidicon lenses.
Visual angle is changed by the focus of lens and the size of image.
　
Calculation formula of the focus of lens:
f=v×D/V (1)
f=h×D/H
(2)
f：focus of lens
V：Vertical dimension of scenery
H：Horizontal dimension of scenery
D：Distance between lens and scenery
v：Vertical dimension of image(as below list)
h：Horizontal dimension of image(as below list)
Format
1 inch
2/3 inch
1/2 inch
1/3 inch
v
9.6 mm
6.6 mm
4.8 mm
3.6 mm
h
12.8 mm
8.8 mm
6.4 mm
4.8 mm
　
　
　
　
　
a)Vertical:
1/2 inch vidicon v=4.8mm
Vertical dimension of scenery V=330mm
Distance between lens and scenery D=2500mm
input the formula (1)
f = 4.8*2500/330=36mm
　
　
b)Horizontal:
1/2 inch vidicon h=6.4mm
Horizontal dimension of scenery H=440mm
Distance between lens and scenery D=2500mm
input the formula (2)
f = 6.4*2500/440=36mm
　
　
　
　
　
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Method and notice of selecting vidicon lenses : 