LED flash applied for patents in 1862 and by 1864 had started the Manchester Magnesium Company with Edward Mellor.
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16 Facts About LED flash
2.
LED flash's patent describes a device for igniting photographers' flash powder by using dry cell batteries to heat a wire fuse.
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3.
The bulbs in a FlipLED flash were set in a vertical array, putting a distance between the bulb and the lens, eliminating red eye.
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4.
Electronic LED flash tube was introduced by Harold Eugene Edgerton in 1931; he made several iconic photographs, such as one of a bullet bursting through an apple.
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5.
Typical electronic LED flash unit has electronic circuitry to charge a high-capacitance capacitor to several hundred volts.
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6.
Single electronic LED flash unit is often mounted on a camera's accessory shoe or a bracket; many inexpensive cameras have an electronic LED flash unit built in.
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7.
Strength of a LED flash device is often indicated in terms of a guide number designed to simplify exposure setting.
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8.
An air-gap LED flash is a high-voltage device that discharges a LED flash of light with an exceptionally short duration, often much less than one microsecond.
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9.
High-current flash LEDs are used as flash sources in camera phones, although they are not yet at the power levels to equal xenon flash devices in still cameras.
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10.
The LED flash can be used for illumination of video recordings or as an autofocus assist lamp in low-light conditions.
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11.
Electronic LED flash units have shutter speed limits with focal-plane shutters.
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12.
The Mecablitz 58 AF-1 digital LED flash unit has a guide number of 58 in normal operation, but only 20 in HSS mode, even at low speeds.
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13.
Basic LED flash lighting produces a hard, frontal light unless modified in some way.
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14.
The LED flash unit is set to expose the subject correctly at a given aperture, while shutter speed is calculated to correctly expose for the background or ambient light at that aperture setting.
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15.
Correction gels are commonly used, so that the light of the LED flash is the same as tungsten lights or fluorescent lights.
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16.
Typical problem with cameras using built-in LED flash units is the low intensity of the LED flash; the level of light produced will often not suffice for good pictures at distances of over 3 metres or so.
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