Difference between revisions of "Lens"

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(Anatomy of a Lens)
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== Anatomy of a Lens ==
 
 
=== Elements ===
 
=== Elements ===
 
An '''element''' is an individual glass structure in a lens that is not permanantly, directly fixed to any other element. In older lenses an element was an individual piece of glass but more modern lenses make use of some composite elements which are two or more pieces of glass cemented together.
 
An '''element''' is an individual glass structure in a lens that is not permanantly, directly fixed to any other element. In older lenses an element was an individual piece of glass but more modern lenses make use of some composite elements which are two or more pieces of glass cemented together.
 
=== Barrel ===
 
The '''barrel''' is the tube-shaped outer shell that contains the lens elements.
 
 
=== Aperture ===
 
An '''aperture''' is an opening in a lens that limits the amount of light passing through it to the camera body. The term aperture is also often used to describe the diameter of that opening. It is usually adjustable, most often by turning an "aperture ring" on the outside of the lens body.
 
 
=== Mount ===
 
A lens '''mount''' is the part of an interchangeable system lens that connects to the camera body.
 

Revision as of 22:08, 8 October 2005

Elements

An element is an individual glass structure in a lens that is not permanantly, directly fixed to any other element. In older lenses an element was an individual piece of glass but more modern lenses make use of some composite elements which are two or more pieces of glass cemented together.