Photographic technique: Combinations Time - Aperture
Both lens aperture and exposure time, hence diaphragm and shutter, affect the image in two different ways: 1°) By modifying the amount of light that reaches the sensor - the aperture affects the intensity of light, the shutter controls the time during wich the sensor i exposed to light. 2°) Each of them has also different effects on the image. The aperture value affects the depth of field,