Flash (photography)

A flash makes a quick burst of light.

It helps you see in the dark. It can also catch fast things in a photo.

Long ago, people used powders. These powders made a bright light. But they also made noise and smoke.

Later, people used small glass bulbs. These bulbs could only be used once. They were very hot after they worked.

Some bulbs came in a cube. This cube had four small bulbs. You could take four photos in a row.

Now, most cameras use electronic flashes. These are very fast. They work almost instantly to make a bright light.

A flash is a tool used in photography. It makes a quick burst of light. This light lasts about 1/1000 of a second.

Most flashes help you see in dark scenes. They can also catch fast-moving objects.

Long ago, photographers used flash powder. This was a mix of magnesium and potassium chlorate. It made a bright light, but it also made smoke and noise.

It could even be dangerous if the powder was damp.

Later, people used flashbulbs. These were glass bulbs with magnesium inside. You could only use them once. They were very hot after they worked. Some bulbs came in a cube.

A Flashcube held four bulbs. The camera would turn the cube to a new bulb after each photo.

Today, most cameras use electronic flash. This is often called a strobe.

It uses a part called a capacitor to hold power. When you take a photo, it lets that power out very fast. This makes the light reach full brightness almost instantly. This speed helps you take clear photos of fast things.

A flash is a tool used in photography to make a quick burst of light. This burst lasts about 1/1000 of a second. The main goal is to light up dark scenes. It can also help capture things that move very fast.

A flash can also change how the light looks in a picture. Some flashes are built right into the camera. Other photographers use a special mount called a hot shoe to add one.

In the past, people used flash powder to make light. This was a mix of magnesium powder and potassium chlorate. A person would put the powder in a pan and light it by hand. This made a bright flash, but it also made noise and smoke.

It could even be dangerous if the powder was damp. Later, photographers used magnesium ribbon in a special holder. This ribbon burned more steadily than round wire.

Newer tools like flashbulbs changed how photography worked. These were glass bulbs filled with oxygen gas and a magnesium filament. When the camera shutter clicked, it ignited the bulb.

You could only use these bulbs one time. They were also very hot right after they were used. Some bulbs, like the GE Mazda No. 75, were huge. That bulb was over eight inches long.

Some cameras used a device called a Flashcube to make things easier. A Flashcube was a module with four separate bulbs inside.

Every time you took a photo, the camera rotated the cube 90 degrees. This let you take four pictures in a row without stopping. Other tools like the Flipflash held ten bulbs in a row. You had to flip the unit over after using half of the bulbs.

Today, most people use electronic flash, which is sometimes called a strobe. This was first introduced by Harold Eugene Edgerton in 1931. An electronic flash uses a part called a capacitor to hold electricity. When the camera is triggered, the capacitor releases that energy very quickly. This makes the light reach full brightness almost instantly. This speed helps photographers take clear pictures of things like a bullet hitting an apple.

A flash is a device used in photography to produce a brief burst of light. This burst typically lasts about 1/1000 of a second. The primary purpose of a flash is to illuminate a dark scene. It can also capture quickly moving objects or change the quality of light.

Modern cameras often activate these units automatically. Some units are built directly into the camera body. Other cameras use a standardized accessory mount called a hot shoe to attach separate units. Professional studios use large, standalone units or studio strobes. These are powered by special battery packs or connected to mains power.

To understand how electronic flash works, we must look at its internal mechanism. An electronic flash unit uses circuitry to charge a high-capacitance capacitor. A capacitor is a component that stores electrical energy. This energy is charged to several hundred volts. When the camera's shutter synchronization contact is triggered, the capacitor discharges rapidly. This discharge happens through a permanent flash tube. This process creates an immediate flash that is shorter than most shutter speeds. Because the light reaches full brightness before the shutter even begins to close, photographers can use faster shutter speeds.

Flash technology has evolved through several distinct stages. The earliest methods used flammable powders or magnesium ribbons. In 1887, German inventors Adolf Miethe and Johannes Gaedicke introduced flash powder. This was a mixture of magnesium powder and potassium chlorate. Photographers put a measured amount into a pan and ignited it by hand. This produced a brilliant flash, but also created smoke and noise.

Later, magnesium ribbon became popular. Edward Sonstadt and the Manchester Magnesium Company produced flat magnesium ribbon. This ribbon burned more consistently than round wire. William Mather also invented a holder to burn the ribbon in a lamp.

Flashbulbs represented a major technological advancement over open powder. These were glass bulbs filled with oxygen gas and a magnesium filament. They were electrically ignited by a contact in the camera shutter. Commercial flashbulbs were first produced in Germany in 1929. These bulbs were single-use and became very hot immediately after use. To improve safety, manufacturers eventually coated bulbs with a plastic film. A blue plastic film was sometimes used to match the spectral quality of daylight-balanced film. Later, magnesium was replaced by zirconium to create an even brighter flash.

Different bulb designs served many different needs in the mid-20th century. The Press 25 bulb was common for newspapermen and reached a peak output of around one million lumens. The GE Mazda No. 75 was the largest flashbulb ever produced. It was over eight inches long and four inches in girth. It was originally developed for nighttime aerial photography during World War II. Other designs like the all-glass PF1 bulb were introduced in 1954 to reduce costs. The PF1 had a faster ignition time than many other bulbs. This allowed it to be used with X synch shutter speeds below 1/250 of a second.

In 1965, Eastman Kodak introduced the Flashcube to simplify photography. A Flashcube was a module containing four expendable flashbulbs. Each bulb was mounted at 90 degrees from the others inside a reflector. The camera's film advance mechanism rotated the cube 90 degrees after every shot. This allowed a user to take four images in rapid succession. Another version called the Magicube used four bulbs but did not require electrical power. Instead, it used cocked wire springs to strike a primer tube. This ignited shredded zirconium foil inside the cube.

Modern electronic flash, often called a strobe, changed photography forever. Harold Eugene Edgerton introduced the electronic flash tube in 1931. This technology reaches full brightness almost instantaneously. Edgerton used this speed to capture iconic images, such as a bullet bursting through an apple. While early units were large and required heavy lead-acid batteries, they became much more portable. By the early 1970s, amateur electronic flashes were available for less than $100. Today, these systems are used in everything from small built-in camera flashes to professional studio setups. Professional studios often use a modelling light to help photographers see the effect of the flash before they take the picture.