What Is ISO in Photography?

How ISO Affects Image Noise

The ISO setting controls your camera’s sensitivity to light. Higher ISO values often introduce more image noise or grain, making pictures look less sharp. Keeping ISO low helps maintain cleaner, clearer photos.

ISO and Exposure

ISO works together with aperture and shutter speed to determine exposure. Raising ISO makes the camera sensor more sensitive, allowing you to brighten photos in low light. However, too much ISO can lead to overexposed and noisy images.

ISO, Light, and General Use

In bright conditions, use a lower ISO for the best image quality. In darker settings, a higher ISO helps capture the scene without a tripod. Always balance ISO with other settings for the sharpest results.