Focal+Length+1

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Focal length in a lens is messured in mm' from the center of the lens to the focal point. The focal point is in directed to the middle where the "focalpoint" will be taken. Short focal length can capture more of the picture. It has a thicker picture angle, long focal length has a thinner picture angle. [] (for both picture and text above)

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Camera lenses are made to create pictures at specific focal lengths. Zoom lenses have a lot of different focal lengths. Focal lengths are measured in millimeters, and tell the distance from the center of the lens to the camera sensor when the subject of the image is in focus. The focal length of a lens determines its angle view, and how much the subject will be magnified. [|Camera Lens Zoom Description | eHow.com] [http://img.ehowcdn.com/article-page-main/ehow/images/a06/b2/tj/camera-lens-zoom-description-800x800.jpg|http://www.ehow.com/about_6654899_camera-lens-zoom-description.html#ixzz1Yas5sWXB] []

The focal length of an optical system is a measure of how strong the system focuses or defocuses light. For an optical system in the air, it's the distance over which initially collimated rays are brought to focas. A system with a smaller focal length has bigger optical power than one with a long focal length. The long focal length bends the ryas more strongly, bringing them to a focus in shorter distance. []



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