What is ISO?
ISO is a camera setting that determines the sensor’s sensitivity to light. It is part of the exposure triangle alongside aperture and shutter speed. Lower ISO values (ISO 100, 200) make the sensor less sensitive to light, producing clean, noise-free images. Higher ISO values (ISO 1600, 6400) amplify the sensor’s sensitivity, brightening the image in low light but introducing digital noise (grain).
Why It Matters
Understanding ISO is essential for achieving properly exposed images across different lighting conditions. For commercial and product photography, keeping ISO as low as possible (typically ISO 100) ensures the cleanest, most professional-looking images. In low-light or action situations, knowing when to increase ISO — and accepting the trade-off of some noise — is critical for capturing the moment.
How It Works
ISO is measured on a doubling scale: ISO 100, 200, 400, 800, 1600, 3200, 6400. Each doubling represents one stop of exposure — doubling the brightness. Modern cameras handle noise increasingly well at high ISOs, but professional product and advertising photography still demands low ISO images. For studio product photography, ISO 100 should always be the starting point. Each camera model has different noise characteristics, and testing your specific camera’s acceptable ISO limits is important.
Real-World Example
A photographer shooting Amazon jewelry in a well-lit studio uses ISO 100, achieving perfectly clean images at f/8, 1/200s with two softbox lights. Moving to an outdoor event with less controlled light, they raise ISO to 800, accepting slight noise to maintain a fast enough shutter speed (1/400s) to freeze movement in the scene.
