Lost the Exposure Triangle? Don’t worry, Fujifilm’s Glossary Series is here to help. The Exposure Triangle is the relationship between aperture, shutter speed, and ISO. For any given sensitivity level selected for film or digital capture, there is an optimum amount of light needed to deliver the correct exposure value (the mix of aperture, shutter speed, and ISO). The trick to achieving the desired exposure value is learning to balance these three controls properly – learn how here!