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The lens gathers and focuses light on a point, called the "point of focus." Lenses may be constructed out of plastic or glass. Some compound lenses are made with both.

What To Look For When Selecting a Lens For [link widoczny dla zalogowanych] A CCD Camera

Focal Length
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Focal length refers to the distance from the centerline of the lens to the point of focus [link widoczny dla zalogowanych] of a beam of light. This is for convex lenses.

The focal length determines how much magnification is provided. Focal length is usually denoted [link widoczny dla zalogowanych] in millimeters. A 28 mm lens gives a larger field of view than a 50 mm lens, etc.

F-number

F-number is the ratio of the diameter of the opening in the lens to the focal length. [link widoczny dla zalogowanych] This number has [link widoczny dla zalogowanych] no dimension (it is distance over distance).

Depth of field refers to how much of the [link widoczny dla zalogowanych] viewing area is in focus. Using a lens with higher f-number allows for more of the view to be [link widoczny dla zalogowanych] in focus.

The size of the CCD sensor has an effect on depth of field, in other [link widoczny dla zalogowanych] words, the same lens will provide a different depth of field on different size CCD sensors.

Viewing Angle

Ultimately, the viewing angle of your camera will be determined by both the focal length of the lens and the size [link widoczny dla zalogowanych] of the camera sensor.

Lens Attachement

There are two types [link widoczny dla zalogowanych] of lens mounts in general use today. The "bayonet" [link widoczny dla zalogowanych] mounting style came about with 35mm cameras, for quickly changing lenses. The second style is a "screw" mount, [link widoczny dla zalogowanych] where the lens is attached to the camera by screwing into the body. You can find adaptors for both screw mount and bayonet mount. One thing to consider when using an adaptor it what [link widoczny dla zalogowanych] effect it will have on [link widoczny dla zalogowanych] the focusing of the lens.

cejy66vd · Posted: Thu 17:33, 05 Sep 2013 Post subject:

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cejy66vd · Posted: Fri 16:58, 06 Sep 2013 Post subject:

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