I used an aperture of f/16 to ensure enough of this still life shot was rendered sharply
The lens aperture provides one of the easiest ways to control the depth of field.
Lower f-numbers, such as f/2.8 or f/4, reduce the depth of field and higher f-numbers, such as f/11 and f/16, increase it.
The lowest f-number/ maximum aperture available on a lens is indicated in its name. Some zoom lenses show a range of apertures, such as f/4-5.6 as the maximum aperture gets smaller as the lens is zoomed in. A lens with a very bright maximum aperture for its focal length, such as the Canon RF 135mm F1.8L IS USM, allows you to create a very shallow depth of field – although you’ll have to pay handsomely for the privilege.