If you’ve got a cat then you’re probably familiar with them ripping your furniture to bits but aside from that, the function of their eyes goes some way to help explain aperture. Anyone who has had contact with man’s second best friend will be familiar with the way a felines iris enlarges contract with the contact of light. This same effect can be applied to photography. When widening the aperture on a camera’s lens make the desired subject appear sharper, whilst causing the background to appear somewhat blurry. In photography, this is known as a shallow depth of field and can be perfect for portraiture, or for that matter, many other types of shot. This type of shot creates a central focus and detracts from the unrelated or undesired background area, making your subject truly stand out. For these types of snaps, you may want to try f/1.8 or closer whenever possible. Happy Snapping!