EXPOSURE TRIANGLE

ISO (from International Organization for Standardization) means Film speed which is the measure of a photographic film's sensitivity to light. Simply for a digital camera it's just a setting that will brighten or darken a photo. As you increase your ISO number, your photos will grow progressively brighter. Here’s an idea of what the ISO numbers mean for particular lighting conditions. ISO 100-200: Best for bright daylight. Results in a crisp image with little grain or noise. Your camera’s default ISO base setting will likely be in this range. ISO 200-400: Slightly less ambient light, such as indoors during the daytime or outdoors in the shade. ISO 400-800: Indoors, with a flash. ISO 800-1600: Low light indoors or at night when you can't use a flash. ISO 1600-3200: Extreme low-light conditions without a flash. Your image will have a lot of grain or digital noise because of the low light. Shutter Speed = the speed at which the shutter of the camera closes. A fast shutter speed creates a shorter exposure — the amount of light the camera takes in — and a slow shutter speed gives the photographer a longer exposure. Aperture = (in optics) a hole or an opening of a lens's diaphragm through which light passes. It affects Depth of Field, the zone of acceptable sharpness in front of and behind the subject on which the lens is focused. Simply put: how sharp or blurry is the area behind your subject (background). The higher Aperture is the sharper background is.