In photography, transmission refers to the passage of light through a transparent or translucent material, such as glass, film, or filters. The degree of transmission determines how much light reaches the camera sensor or film, affecting exposure, contrast, and overall image quality.
Understanding transmission is essential for photographers when selecting lenses, filters, or lighting modifiers. By controlling and measuring transmission, photographers can achieve accurate exposures, enhance colour fidelity, and produce images with the desired clarity and tonal range.