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Lens Opening

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   is described as   
The Lens Opening
The opening in a camera lens through which light passes to expose the film. The size of aperture is either fixed or adjustable. Aperture size is usually calibrated in f-numbers-the larger the number, the smaller the lens opening.
Automatic Camera
   is described as   
A Camera That Automatically Adjusts the Lens Opening & Shutter Speed
For proper exposure.
   is described as   
A Number That Indicates the Size of the Lens Opening on an Adjustable Camera.
The common f-numbers are f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, and f/22. The larger the f-number, the smaller the lens opening. In this series. Also called f-stops, they work in conjunction with shutter speeds to indicate exposure settings.
Lens Speed
   is described as   
The Largest Lens Opening (smallest F-number) at Which a Lens Can Be Set
A fast lens transmits more light and has a larger opening than a slow lens.
Selective Focus
   is described as   
Choosing a Lens Opening That Produces a Shallow Depth of Field.
Usually this is used to isolate a subject by causing most other elements in the scene to be blurred.
Aperture Priority
   is described as   
An Exposure Mode That Lets You Set the Size of the Lens Opening.
   is described as   
Lens Opening.

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