What is ISO in Photography?
Your camera's ISO is your camera's sensitivity to light as to how much light is needed to produce a quality photo. A lower value means less sensitivity, and thus more light is required. Conversely, a higher value means the opposite. It's one element of photography's exposure triangle- along with aperture and shutter speed - and plays an essential role in the quality of your photos.
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ISO 100-200: This ISO range is ideal for shooting in bright daylight conditions and typically produces sharp images with minimal grain or noise. Many cameras have a default ISO base setting within this range.
ISO 200-400: This ISO range is suitable for shooting in environments with slightly less ambient light, such as indoors during the daytime or in shaded outdoor areas.
ISO 400-800: Low light indoors or at night when you can't use a flash.
ISO 800-1600: This ISO range is suitable for low light conditions indoors or at night when a flash cannot be used.
ISO 1600-3200: This ISO range is appropriate for shooting in extreme low-light conditions without a flash. However, the resulting image may have significant grain or digital noise due to the low light.
ISO settings below 100 or above 6400 are usually reserved for specialized camera applications, such as night photography, capturing extremely fast movement, or using a long lens on a handheld camera.