Aperture is the opening in the lens of the camera. A small opening like F:16 requires more time to form an image than an opening like F:1.4 that requires less time.
aperture settings
Apple users can use Aperture for there photography needs.
F-Stop
F Stop
The largest camera aperture is f stop 1.4, which lets the most amount of light into the camera.
Aperture Magazine is a quarterly photographic magazine and publishing work. The articles are devoted to the fine art of photography. Aperture Magazine is a non-profit organization.
Manual or Aperture Priority.
The three building blocks are ISO shutter speed and aperture
High shutter speed and fast lens/Big open aperture.
Aperture priority lets you set the aperture you want and the camera sets the shutter speed for you. You use it when you want to control depth of field. Shutter priority lets you set the shutter speed you want and the camera sets the aperture for you. You use it when you want to control how motion is rendered in the photograph. Program mode sets both shutter speed and aperture for you. Use it when you are not concerned with aperture or shutter speed control.
The f-number is indicative of aperture. The smaller the number, the larger the aperture is, and the more light is let in. The Depth-of-Field is also reduced with a smaller f-number. f/1.7 is a very large aperture, and there will be little depth of field, but lots of brightness.
When a small aperture setting is used, such as f/11, a large depth of field will be achieved. One would use this, say, if they wanted to take a landscape photograph, and have most of the photo in focus. When a medium aperture setting is used, such as f/4, less of the photograph will be in focus, but not as much as if one were to use an aperture setting of f/1.8. A medium setting like f/4 could be used for a group photo. When a large aperture setting is used, such as f/1.8, a very small slice of the photograph will be in focus (shallow DOF.) This large aperture setting could be used for plant photography, macro photography, insect photography, etc.