Understand how exposure works by following this simple three-pointed guide

The relationship between shutter speed, aperture and ISO is at the heart of all photography. At one time, shutter speed and aperture were the only exposure variables you could change from one shot to the next as the ISO was set by the type of film you were using. The introduction of digital cameras has made it possible to change

ISO shot by shot rather than unloading film or switching bodies. Photographers now have more control over exposure than ever before…