valotusjärjestelmä

Valotusjärjestelmä refers to the lighting system of a camera. It encompasses all the components and settings that control how light reaches the camera's sensor or film, ultimately determining the exposure of the image. The core elements of a valotusjärjestelmä include the aperture, shutter speed, and ISO sensitivity.

The aperture, controlled by the diaphragm within the lens, dictates the size of the opening through which light passes. A wider aperture (smaller f-number) allows more light in and creates a shallow depth of field, while a narrower aperture (larger f-number) allows less light and results in a greater depth of field.

Shutter speed determines the duration for which the camera's shutter remains open, allowing light to hit the sensor. A fast shutter speed freezes motion and lets in less light, while a slow shutter speed can blur movement and allows more light.

ISO sensitivity refers to the sensor's or film's sensitivity to light. A lower ISO value means less sensitivity and cleaner images, whereas a higher ISO value increases sensitivity, allowing for shooting in low light but potentially introducing digital noise.

These three elements—aperture, shutter speed, and ISO—work together in what is known as the "exposure triangle" to achieve a properly exposed photograph. Photographers adjust these settings to balance the amount of light captured, influencing both the brightness of the image and its creative aspects like depth of field and motion blur. Modern cameras often offer automatic modes that manage the valotusjärjestelmä, but manual control allows for greater artistic freedom and technical precision.