Aperture
What is aperture?
Aperture is the amount of time shutter speed is open, that permits light to come through the lens.
How does it work technically?
The lower you have your f/stop, the more light enters. The higher you have your f/stop the less light enters. The lower f/stops causes a small depth of field, and the higher f/stop causes a large depth of field.
How does it work visually?
When you have a lower f/stop, and you have a small depth of field, it separates the subject from the background. Causing a blur. When you have a higher f/stop, and a high depth of field, it creates a clear picture, and no part of the picture will turn out blurry.
Relationship to exposure triangle
When you change the f/stop you need to change the shutter speed to balance the scale out at zero, on the camera before you take the picture. This also goes for when you change the shutter speed and you need to change the f/stop to balance out. You do not need to change the ISO.
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