Autoeksponering

Autoeksponering refers to automatic exposure control in photography and cinematography. It automatically selects a suitable combination of shutter speed, aperture, and sometimes ISO to render a scene with a pleasing brightness, based on a metered assessment of the incoming light.

Most cameras use light metering to evaluate scene brightness. Common metering modes include evaluative (matrix), center-weighted, and spot metering. The metering data are used to compute an exposure value (EV), which guides the camera to set shutter speed and aperture. In many cameras, ISO can also be set automatically (Auto ISO), adding another degree of flexibility. Exposure decisions are usually made within exposure modes: Program (P), Aperture Priority (A or AV), Shutter Priority (S or TV), and Manual (M). In automatic modes, the camera chooses shutter speed and aperture; in semi-automatic modes, the user selects one parameter and the camera selects the other.

Strengths and limitations: Autoeksponering works well for typical scenes and rapidly changing light, but it can fail in high-contrast situations, leading to underexposure of shadows or blown highlights. In such cases, photographers can use exposure compensation to bias the result, or switch to manual or semi-automatic modes.

Variants and refinements include Auto Exposure Bracketing (AEB), which captures multiple exposures for later blending, and advanced metering systems that consider faces, scenes, or highlight/shadow priorities. Autoeksponering remains a fundamental feature in most consumer and professional cameras, streamlining image capture while leaving room for manual control when needed.