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Basic tips for ISO setting in a digital camera
Often, we do not pay attention to the ISO settings of a camera, which is in fact very important. If one gives enough attention to this feature of the camera, we can take quality pictures. The ISO setting is related to the sensitivity of a digital camera to light. The higher the ISO, the more sensitive it is to light.
If, you examine the ISO setting, you will find that each ISO setting is double the one before: if you increase the ISO from 100 to 200, you double the camera’s sensitivity; and if you increase it from 200 to 400, you double it again, and hence forth.

The basic fact is that the lens aperture, shutter speed and ISO form the ‘exposure triangle’ for good photography. For instance, if you want to use a faster shutter speed without changing the aperture, you could increase the ISO instead.

It needs to be understood that when the ISO setting is increased, the light values from the subject become higher. However, the higher the ISO value, the worse the noise. Therefore, for good pictures ISO adjustments are best kept for situations where they are absolutely necessary. One should think about the ISO if the light levels fall to the point where you ‘run out of apertures’ and a slight camera shake can spoil the picture.

You should increase the ISO if you’re shooting in marginal conditions. Just remember that when light is strong, keep the ISO setting as low as permissible. When there is very less light like candle light or twilight, keep the ISO high but use a tripod or firm rest with a cable release or time release for shutter opening of the camera.

For example, when the light is harsh and you wish to take a land scape, use IS0 setting from 50 to 100. And, for daytime outdoor sports set the ISO value at 200. For astro-photography, keep the highest range of ISO values and camera should be mounted on tripod.

The higher values of ISO setting in dim light without camera shake, will give you clear image but with some background noise.

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