Respuesta :
Aperture priorityis the A or Av on a camera mode dial, is a setting on some cameras that allows the user to set a specific aperture value while the camera selects a shutter speed to match it that will result in proper exposure based on the lighting conditions as measured by the camera's light meter
I researched about it now I know what it means lol.
I think the answer to this question is The focal length. I hope this helps
