Often, we need to add extra light to a scene to ensure we have enough light to create an image, freeze movement, or simply enhance the scene for the sake of the photograph. The primary way photographers do this is by using a flash.
The electronic flash has been around since 1931 and, today, there are several variations—all with different potential uses for the photographer. Here, we will take a quick look at the types, compare them, and discuss the benefits of each type.
Terminology Basics
Before we dive into flash types, let’s get familiar with some important terms that are found in the field of strobe lighting.
TTL
TTL stands for “through the lens” and it refers to the ability of the camera to control the flash output automatically, based on the metering information from the camera. Many modern electronic flashes, when used with a compatible camera, offer this automatic control of the flash.
Power—Watt Seconds
“Watt seconds” is a unit of energy (equivalent to the joule) that measures strobe power. The higher the number, the brighter the light. You’ll see this number in the specifications for monolights, power packs, and strobes.
Power—Guide Number
“Guide number” is a measure of flash power. Like watt seconds, the higher the number, the more powerful the flash. You will see this number in the specs for on-camera speedlights.
Light Modifiers
One way to control the output or spread of a light is through the use of a light modifier. These optional tools attach to the flash to give photographers greater control of how light is transmitted through a scene or how it falls on a subject.
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