What does the f-stop number indicate regarding a camera lens?

The f-stop number is a critical element in understanding camera exposure, specifically related to the lens aperture. It indicates the size of the lens opening through which light enters the camera. A lower f-stop number, such as f/2.8, corresponds with a larger aperture, allowing more light to hit the camera sensor. Conversely, a higher f-stop number, like f/16, indicates a smaller aperture, which allows less light.

This concept is essential for controlling depth of field and overall exposure. A larger aperture (lower f-stop number) results in a shallower depth of field, which is useful for isolating subjects with a blurred background, while a smaller aperture (higher f-stop number) increases depth of field, keeping more of the scene in focus.

In contrast, the other options refer to different aspects of photography. The speed of the shutter relates to how long the camera's shutter remains open, affecting motion blur and exposure time. Image stabilization deals with reducing blurriness due to camera movement, and the distance from the subject refers to the physical space between the camera and the subject, which can influence composition and magnification. Each of these elements plays a role in photography, but none directly relate to the f-stop number as it pertains