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While it is true that the F -22 maintenance program at the northern Utah base will not grow in the ways some local leaders had hoped, there is little worry ...
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white_evo27
Sun, 23 Aug 2009 21:05:02 GM
Greddy E-Manage kit for sale!!! selling for a friend... not sure exactly what model this is but i kno it works it just came out of his car... shoot.
What's the meaning of the f-numbers used for the studio light setup?
Q. I saw different diagrams in magazines and Internet, and I don't know exactly what they mean. I know that you use f-numbers for the different apertures in the lens diaphragm and this control the amount of light and the depth of field in the picture, but I don't know what they mean when people used them for the setup of the lights in a studio?
Asked by Loli - Sat Jul 14 23:00:18 2007 - - 4 Answers - 0 Comments
A. The f-stop and TV Studio Lighting By Mike Wood More correctly called the f-number the f-stop (or stop) of a lens is proportional to the ratio of the focal length of the lens to its aperture (or iris) and gives a measure of the light transmitted by the lens. As the area of the iris (and thus the light transmitted) is proportional to the square of its diameter increasing the aperture by a factor of 1.4 (square root of 2) will double the light. This explains the sequence 1, 1.4, 2, 2.8, 4, 5.6, 8, 11, 16 you will be familiar with on a camera's iris. So one 'stop' open on an iris represents a doubling of the transmitted light. why is this relevant to lighting? Surely a cameraman would always like as much light as he can get - well, not… [cont.]
Answered by Teresa H - Sat Jul 14 23:05:10 2007
Q. I saw different diagrams in magazines and Internet, and I don't know exactly what they mean. I know that you use f-numbers for the different apertures in the lens diaphragm and this control the amount of light and the depth of field in the picture, but I don't know what they mean when people used them for the setup of the lights in a studio?
Asked by Loli - Sat Jul 14 23:00:18 2007 - - 4 Answers - 0 Comments
A. The f-stop and TV Studio Lighting By Mike Wood More correctly called the f-number the f-stop (or stop) of a lens is proportional to the ratio of the focal length of the lens to its aperture (or iris) and gives a measure of the light transmitted by the lens. As the area of the iris (and thus the light transmitted) is proportional to the square of its diameter increasing the aperture by a factor of 1.4 (square root of 2) will double the light. This explains the sequence 1, 1.4, 2, 2.8, 4, 5.6, 8, 11, 16 you will be familiar with on a camera's iris. So one 'stop' open on an iris represents a doubling of the transmitted light. why is this relevant to lighting? Surely a cameraman would always like as much light as he can get - well, not… [cont.]
Answered by Teresa H - Sat Jul 14 23:05:10 2007
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