Most of the Digital Camera users don't know about ISO or are confused and many who know don't care about it and leave it on "Auto Mode" so that camera can automatically adjust settings according to conditions. But digital cameras don't take correct decision at all times and also sometimes they are very easily fooled by the light conditions and then your image go underexposed or overexposed or blurred.
ISO can really improve quality of images if used correctly. At first, you might face some difficulties in changing the ISO settings according to condition but with some practice you can master it and then it will all be very easy and in no time you can improve your photography skills.
ISO
ISO is related to sensitivity of image sensor. It defines how sensitive your image sensor is sensitive to light. If you decrease the ISO value, then your sensitivity of the sensor will decrease and vice-versa. If you are photographing in broad daylight or in a place where there more than sufficient light and your image is overexposed then, you can try lowering ISO number which will make you camera sensor less sensitive to light or you can try increasing ISO number in darker places which will make your camera sensor more sensitive to light which can be helpful in darker places.
The above image is taken at ISO 80 under a light bulb (not sufficient light).
The above image was taken at ISO 400 under same light conditions.Changing the ISO is useful in low light situations or to get the best quality images. Dropping the ISO number to least possible value, say, ISO 80 will get the best quality out of the sensor. However, this requires a well lit up scene and is best for studio light setups or broad daylight. On other hand, for darker places, increasing the ISO number will help but images sometimes turn out grainy. For best results in such cases, a good balance between ISO, aperture size and shutter speed is required.
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