Croydon Camera Club
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How To: Camera Basics, by Mike Farley LRPS
Stops

Each step in the adjustment of speeds to double or halve an exposure value is often referred to as a stop, the term being a relic of the Victorian era at the dawn of photography. Originally, when cameras were much simpler, it referred just to lenses and altering the aperture was the only control the photographer had. These days, it is also used when referring to adjustments for shutter speed and ISO.