A speedlight is a colloquial term used to describe a flash which can be secured to the hotshoe of a camera, with the potential of being used off-camera when combined with a flash trigger. They are quick and convenient, allowing them to be used in situations where speed and flexibility are the priority of the photographer.
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How do I use a speedlight indoors?
How do I use a speedlight outdoors?
Speedlights & Flash
Modifiers for Speedlights and Flash
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Understanding Guide Numbers
Guide Numbers were essential in the days of film when we couldn’t see the end result of an exposure and had to be sure of its accuracy before capturing the image