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Depth of Field - While a lens focuses on a single plane of depth, there is usually an additional area in focus behind and in front of that plane. This is depth of field. Depth of field increases as the iris is closed.. Used . There is more depth of field the wider the lens and le . Used . ...

Subs - A sub or subwoofer is a speaker dedicated to the reproduction of bass frequencies, usually from about 20 Hz to about 200 Hz. . Used . . Used . ...

Pattern - Pattern refers to the shape, quality and evenness of a lamp's output. The pattern of light an instrument makes is largely determined by three factors. The first are the specifics of the bulb, reflecto. Used . r and lens assembly. Different mounting positions for the bulb (axial, base up, base down), different sizes and shapes of reflector and the nature of the lens (or lenses) being used can all a. Used . ffect the pattern of light. Secondly, the specifics of how the lamp is focused affect its pattern. In Ellipsoidal Reflector Spotlights (ERS) and their derivatives (see below), there are two beams of light emit...

Bulbs - A Bulb or light bulb is a source of artificial light. There are many different kinds of bulbs including High Intensity Discharge or HIDs, Halogen, Fluorescent and Light Emitting Diodes, but the most . Used . common is the incandescence that works by the release of electromagnetic radiation. . Used . ...

Dichroic - In optics, the term dichroic has two related but distinct meanings. A dichroic material is one which either causes light to be split up into distinct beams of different wavelengths (colours), or, one . Used . in which light rays having different polarizations are absorbed by different amounts.

The original meaning of dichroic (from the Greek dikhroos, two-coloured) refers to any optic. Used . al device which can split a beam of light into two beams with differing wavelengths. Such devices include mirrors and filters, usually treated with optical coatings, which are designed to reflect light over a ...