Camera Lens Apertures Bernie
The lens aperture controls the amount of light entering through the lens, and also controls the depth of field. It’s not really complicated, so don’t be put off by the weird numbering and the back to front system
Apertures are in the lens, not in the camera
Camera Lens apertures control the amount of light entering the camera.
Numbers prefixed with letter 'F' are used to set aperture size
Each major 'F' number is known as a 'stop'
Aperture or Shutter Speed priority - which one should you use?