| focal length |
In photography, the distance from the center of the lens to the image of an object at infinity. At same size, the distance from copy to image is four times the focal length of the lens. This also applies to lithographic process lens as well.
출처: www.davegroth.com/terms/F.shtml
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| focal length |
The distance between the optical centre of a lens and the principal convergent focus point.
출처: www.2seetv.co.uk/acatalog/Glossary_of_Terms.html
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| focal length |
The distance from the lens to the film plane or sensor that focuses light at infinity. The length, expressed in millimeters, is more useful as an indication of the angle of view of a particular lens. A shorter focal length lens, such as a 28mm, offers a wider angle of view than a longer one, such as 100mm.
출처: www.bestcameraprices.com/glossary.htm
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| focal length |
This is the length of the light path, from the objective to the focal plane. The magnification is the focal length of the telescope divided by the focal length of the eyepiece. See also focal ratio.
출처: www.astronexus.com/saafaq/glossary.php
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| focal length |
The optical property of a lens. In projection terms, the smaller the focal length, the larger the projected image is likely to be.
출처: www.qeiicc.co.uk/organising_an_event/av/glossary
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