The lens aperture is a property that indicates how much light the lens is capable of letting through to the drone's image sensor. The f/2.8 value is a specific aperture number, and it holds that the lower this number is, the more light passes through the lens. This allows the drone to capture higher quality footage in poorer lighting conditions, for example, at dusk or in overcast weather, without having to significantly increase the sensor's sensitivity, or ISO, which would lead to the creation of digital noise. A lower aperture number also allows for a shallower depth of field, that is, the effect where the main subject is sharp and the background behind it is naturally blurred.