![]() ![]() Philips PFB5 Trade Mark Photoflux Flash bulbsīy Henk Albert de Klerk licensed under the Creative Commons Attribution-Share Alike 4.0 International license How Modern Flash Works Some cameras even had an ejection system that would pop the used bulb out automatically. The bulbs were so hot you could burn yourself. Those of us who have reached a certain age can remember those old flash bulbs and how surprisingly hot they got from that incredibly brief flash. ![]() Photography wasn’t an especially safe profession. The rapid expansion of gas and resultant shockwave would also occasionally shatter the more fragile early glass bulbs. A single shot would burn up the filament or foil, rendering the bulb useless. This occurred so quickly that the gas inside the bulb expanded and created a small pressure shockwave that caused a popping sound. ![]() One of the early flash bulbs, the Vacu-blitz, was actually filled with thin, crumpled-up aluminum foil!Īpplication of an electric charge caused the filament or foil to rapidly heat up and burn, generating heat and light. The bulb, a glass element containing two electrodes connected by a filament or foil made of magnesium, zirconium or aluminum, was filled with oxygen and sealed at the base. And, like gunpowder, it was dangerous, with a number of photographers suffering burns from flash powder accidents!Įverything changed when single-use flash bulbs were invented around the 1930s. Like gunpowder, it burned so rapidly that there was an almost instantaneous flash of light. The introduction of flash powder as a way to generate portable, short-duration light, was a game changer. So long that portrait photographers used braces behind their subjects to help them stay still during an exposure that could last two or three minutes. The camera shutter had to be open for a long time. The Invention of Flashīack in the early days of photography, there was no flash or artificial light. You can also learn more about using speedlights creatively in the Lighting in a Flash video workshop. FYI: Improve Photography has recommendations for flash kits in the Recommended Gear section. ![]()
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