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Formula for calculation
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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. |
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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 table) /
h: horizontal size of image (see table) |
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Format
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1 inch
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2/3 inch
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1/2 inch
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1/3 inch
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v
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9.6mm
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6.6mm
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4.8mm
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3.6mm
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h
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12.8mm
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8.8mm
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6.4mm
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4.8mm
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Vertical & Horizontal Size Formulas
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a) In case of vertical size
1/2 inch camera
Vertical size of object
Distance from lens to formula (1)
V=4.8mm V=330mm D=2500mm
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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
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| Diagram Example |
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| Focal Length |
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| The distance from the center of the lens to a plane at which point a sharp image of an object viewed at an infinite position. The focal length determines the size of the image and angle of FOV seen by the camera through the lens. This is the center of the lens to the image pickup device. |
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