Glossary Of Terms (M - R) - CCTV by Instrom Ltd
MAGNIFICATION RATIO
The ratio between the focal length of a lens and the focal length of a standard angle lens. Indicates the magnification of the image when compared to an image from a standard angle lens.

MANUAL IRIS
Type of lens that requires manual focusing.

MATRIX SWITCHER
Advanced type of switcher in which a signal from any input can be switched to any number or combination of outputs. Generally used in larger and more complex systems the matrix will usually also incorporate a range of additional advanced features.

MICROWAVE TRANSMISSION
A method of transmitting signals using a microwave frequency link. Not affected by adverse weather but requires direct line of site. A licence may be required to operate a microwave frequency system.

MODEM
Derived from the term Modulate-Demodulate. A modem is used to convert between analogue and digital signal to then transmit and receive t ... Read more »