Apertures (different) all at same shutter speed 1/125

f1.4 @ 1/125




 











f5.6 @ 1/125

 

 f8 @ 1/125

 f11 @ 1/125

f16 @ 1/125

As the f number increases (from f1.4 to f16) 

- the aperture gets smaller 

- less light gets in the camera and 

- the image gets darker.