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What is ISO in Photography?

The ISO speed of film or digital camera sensors is derived from standards adopted by the International Organization for Standardization, which is made up of representatives of several national standardization entities. In Digital Photography ISO measures the sensitivity of the image sensor. The same principles apply as in film photography – the lower the number the less sensitive your camera is to light and the finer the grain. Higher ISO settings are generally used in darker situations to get faster shutter speeds.

IS Higher the ISO Better?
The lower the ISO number, the less sensitive it is to the light, while a higher ISO number increases the sensitivity of your camera. The component within your camera that can change sensitivity is called “image sensor” or simply “sensor”.


 What is ISO setting?
In the case of digital cameras, ISO sensitivity is a measure of the camera's ability to capture light. Digital cameras convert the light that falls on the image sensor into electrical signals for processing. If you raise ISO sensitivity, you can choose faster shutter speeds and reduce camera blur.

What is best ISO in outdoor Photography?
Here's a good stock setting for outdoor headshots: set Manual mode, Auto IS with shutter speed at 1/250 sec and the aperture at its widest setting, such as f/4. With flash, use a similar setting but with ISO 100. Take test shots to work out the best pairing of aperture and flash power.

What is best ISO in indoor Photography?

The same principles apply as in film photography – the lower the number the less sensitive your camera is to light and the finer the grain. Higher ISO settings are generally used in darker situations to get faster shutter speeds. For example an indoor sports event when you want to freeze the action in lower light.

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