Now I’ve tried to simplify these definitions but that is no easy task. Whole books are written in great detail about these terms. However, for now I am going to concentrate on remembering that all three of these directly relate to each other and work together to enable a photographer to capture images in creative ways. That said, I need to get lots of practice using different settings in each feature so I can begin to understand their relationships and power.
Next I am going to post about the different shooting modes.
ISO stands for International Standards Organization. It is the film’s sensitivity to light. The ISO lets your light meter know exactly what combinations of aperture and shutter speed it can use to record an exposure. The higher the ISO number is, the less light that is needed to make a picture. The lower the ISO number is, the more light that’s needed to make a picture. Higher ISO numbers can make the image grainier but it depends on what you want in your exposure. A higher ISO might be good if you want to freeze the action in sharply focused detail.