ISO stands for International Standards Organisation. In the case of photography, it refers to the industry norm for sensitivity of emulsion based film. In the case of digital photography, ISO indicates a digital camera sensors sensitivity to light.
The higher the sensitivity, the less light is needed to make an exposure. So, shooting at a higher ISO value requires less light than shooting at a lower ISO value.
Shooting at lower ISO values result in images with the least visible noise. The higher the ISO value, more will be the visible noise. The amount and degree of noise varies from camera to camera. High end DSLRs can produce good quality images even at high ISO values.
The ISO values found on most digital cameras varies from 100 (Base value) and increases by power of 2. So, we will have values like 100, 200, 400, 800, 1600 and so on. Theoretically, the amount of light required to make a good exposure at ISO 200 is half the light required for the same shot at ISO 100.
The ISO settings can be related to a cameras shutter speed and aperture. For a low ISO value, since more light is required, the shutter speed needs to be lower and a greater aperture is required. For high ISO values, high shutter speeds can be used and only a smaller aperture is necessary.
A high ISO value along with proper adjustments of shutter speed and aperture can be used to capture high speed actions such as sports.
The higher the sensitivity, the less light is needed to make an exposure. So, shooting at a higher ISO value requires less light than shooting at a lower ISO value.
Shooting at lower ISO values result in images with the least visible noise. The higher the ISO value, more will be the visible noise. The amount and degree of noise varies from camera to camera. High end DSLRs can produce good quality images even at high ISO values.
The ISO values found on most digital cameras varies from 100 (Base value) and increases by power of 2. So, we will have values like 100, 200, 400, 800, 1600 and so on. Theoretically, the amount of light required to make a good exposure at ISO 200 is half the light required for the same shot at ISO 100.
The ISO settings can be related to a cameras shutter speed and aperture. For a low ISO value, since more light is required, the shutter speed needs to be lower and a greater aperture is required. For high ISO values, high shutter speeds can be used and only a smaller aperture is necessary.
A high ISO value along with proper adjustments of shutter speed and aperture can be used to capture high speed actions such as sports.
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