ISO (or ASA) is the indication of how sensitive a film was to light in analogue photography. It is measured in numbers – 100, 200, 400, 800 etc. The lower the number the lower the sensitivity of the film and the finer the grain in the shots you’re taking.
If you mostly take pictures where there is enough light for a correct exposure, i.e. sunny outdoors, then using the lowest ISO on your digital camera will give you the best image quality your digital camera is capable of. If you want to take pictures indoors where light may not be sufficient and in other low-light situations, then you would need to supplement existing light with flash or studio lights or select a higher ISO.
If you mostly take pictures where there is enough light for a correct exposure, i.e. sunny outdoors, then using the lowest ISO on your digital camera will give you the best image quality your digital camera is capable of. If you want to take pictures indoors where light may not be sufficient and in other low-light situations, then you would need to supplement existing light with flash or studio lights or select a higher ISO.
- The best image quality is usually obtained at the lowest ISO setting on your digital camera.
- Using a higher ISO usually results in noisy images on consumer digital cameras.
- Use a high ISO if it is a choice between missing a picture and being able to capture an image but it means you need to spend time cleaning out the noise in post-processing using a noise reduction software.
- If you leave your camera on "Auto ISO" and if you find that most of your images are noisy, then perhaps you are taking most of your pictures in low-light situations where the camera has automatically selected a higher ISO.
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