What is ISO and EV in camera?

ISO stands for International Organization for Standardization, which is responsible for setting standards in various industries, including photography. In the context of a camera, ISO refers to the sensitivity of the camera's image sensor to light. A higher ISO value makes the sensor more sensitive to light, allowing for better exposure in low-light conditions. However, increasing the ISO also introduces more digital noise in the image. EV, on the other hand, stands for Exposure Value and is a measure of the camera's exposure settings, taking into account the aperture, shutter speed, and ISO. It helps photographers determine the correct exposure for a given scene.

Controlling exposure is the most basic principle in photography. Exposure amount is often expressed as an "EV" value. Film sensitivity indicates how sensitive a film (or CCD) is to light. This sensitivity is represented using ISO values, such as ISO100 or ISO200.