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How To: Camera Basics, by Mike Farley LRPS
Introduction Camera Types Sensor Sizes Crop Sensors Aperture and Lenses Shutter ISO Stops Using Shutter Speeds Creatively Using Aperture Creatively Hyperfocal Distance Using the Camera Controls
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.