ISO for digital photographers. Everything you need to know about ISO, noise and DSLRs.
• What is ISO?
• How does ISO affect image noise?
• What is the best ISO setting?
• How can I reduce image noise?
The ISO control changes your camera sensor’s sensitivity to light. As you increase ISO the sensor becomes more sensitive (also referred to as “faster”) so you need less light to make an exposure.
Conversely, as ISO decreases the sensor becomes less sensitive, and needs more light to make an exposure. It’s important to understand that as ISO increases, so too does image noise. Noise, in this context, has nothing to do with the beeping sounds your camera makes when it focuses! Rather, it describes those dots and coloured artefacts you see in some images.The ISO control changes your camera sensor’s sensitivity to light. As you increase ISO the sensor becomes more sensitive (also referred to as “faster”) so you need less light to make an exposure. Conversely, as ISO decreases the sensor becomes less sensitive, and you need more light to make an exposure...