ISO Sensitivity in Camera : Explained | Basics of Photography | For Beginners | By Afroz Akhter

ISO is a term used in photography to describe the sensitivity of the camera's image sensor to light. It is one of the three key elements of exposure, along with shutter speed and aperture, and plays a vital role in determining the brightness and quality of the image.

The ISO value is represented by a number, such as ISO 100, ISO 200, ISO 400, etc. The lower the ISO number, the less sensitive the sensor is to light, and the higher the number, the more sensitive it is. In other words, a low ISO setting is suitable for bright outdoor conditions, while a high ISO is necessary for low-light situations.

When you increase the ISO value, the camera's sensor becomes more sensitive to light, and as a result, you can use faster shutter speeds or smaller apertures to achieve the same exposure. However, high ISO settings also introduce noise or grain in the image, which can reduce image quality. Therefore, it's essential to find a balance between ISO, shutter speed, and aperture to achieve the desired image quality.

ISO is particularly important when photographing in low light conditions, where increasing the ISO value is necessary to maintain an appropriate exposure without sacrificing image sharpness or introducing too much noise. It's also essential to keep in mind that different camera models have different ISO performance, and higher-end cameras tend to have better ISO performance with less noise even at higher ISO settings.

In summary, ISO is a crucial aspect of photography that plays a significant role in determining the exposure and quality of the final image. Understanding how to adjust the ISO value according to the available light is essential for achieving the desired results.
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