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| Fail Safe Lock |
An electric lock that automatically unlocks when power is removed from the lock. |
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| Fail Secure Lock |
An electric lock that automatically locks when power is removed from the lock. |
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| Fast Address (Bosch AutoDome) |
A system for setting the address of the AutoDome remotely from the control system. |
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| Field of View |
The measure of the visible area within the camera's field of view. The larger the focal length, the smaller the field fo view. the smaller the focal length, the wider the field of view. |
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| Focal Length |
The distance from the optical center of the lens to the image of an object located at an infinite distance from the lens. Long focal lengths give a small field of view (e.g. telephoto effect), while short focal lengths give a wide angle view. |
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| F-Number |
The standard measure of the lens aperture, which is the iris diameter, divided by the focal length of the lens. The lower the maximum aperture (or F-Number), the more light that passes through the lens. |
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| F-Stop |
See F-Number |
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Glossary