Mastering Your SLR Part 4 - ISO -The Third Point Of The Photography Exposure Triangle

In this article series we reviewed Shutter Priority mode in Part 2 and Aperture Priority mode in Part 3, which are two of the three parts of the photography exposure triangle. The third point of the triangle is the ISO settings. In low light situations you can adjust the aperture and shutter speed of your camera but this may not be enough to capture that perfect photograph - you may also need to adjust the ISO setting. What is ISO? It is an acronym that stands for the International Standards Organization and it is a measure of a camera sensor's sensitivity to light when the camera's shutter is opened. It used to be referred to as ASA, an acronym for the American Standards Association, being a measure of the speed of film used in cameras. The lower the ASA or ISO number . . . (to read the remainder of this article, please log in below.)