Aperture refers to the diaphragm opening inside a lens. How wide the aperture is open is indicated by the F-number. The lower the number, the wider it is. The wider it is, more light goes through it.
Think of it at your eye lids again, but instead of being the duration of the eye lid being kept open, aperture is like how wide your eye lid is to open.
or here’s how one of our readers thought of it….
“Think of it at your pupil size, in a dark room your pupils get wider and lets more light in to your eyes. On a sunny beach your pupils retracts and get smaller.”
When you set the aperture value to the lowest value available (meaning widest aperture) then it would open the aperture blades as wide as it can. The aperture will close to the width as indicated by the setting in the camera. Increase the value and the aperture will reduce in opening size accordingly.
The aperture available depends on the lens you’re using. The F-number will also be displayed on your camera’s indicator, in the image below we see that the aperture is indicated – at f/2.5
The aperture also affect Depth of Field, however I will cover this in one of my upcoming articles as it can get pretty lengthy.
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