CALM: Computer Assisted Learning Method Recent Announcements CALM Service Restored! Due to hardware failure on the CALM servers, we were forced to shut down the CALM system from the period of 11/15/2013 - 11/18/2013. As of 5:45 AM, 11/19/2013, we have CALM back up and running with all data ...
Chemical Formula Search - Welcome to the NIST WebBook Enter the desired chemical formula (e.g., C4H*Cl): Select any desired options for the search: Exactly match the specified isotopes. (Help) Allow elements not specified in formula. (Help) Allow more atoms of elements in formula than specified. (Help) Exclu
F-number - Wikipedia, the free encyclopedia In optics, the f-number (sometimes called focal ratio, f-ratio, f-stop, or relative aperture[1]) of an optical system is the ratio of the lens's focal length to the diameter of the entrance pupil.[2] It is a dimensionless number that is a quantitative mea
Understanding Your Camera: F-Numbers, F-Stops and Stops ... 10 Jan 2011 ... Understanding Your Camera: F-Numbers, F-Stops and Stops : martybugs.net photography blog.
Numerical aperture - Wikipedia, the free encyclopedia By incorporating index of refraction in its definition, NA has the property that it is constant for a beam as it goes from one ... 1.1 Numerical aperture versus f- number; 1.2 Working (effective) f-number.
F-number - Wikipedia, the free encyclopedia where N is the uncorrected f-number, NAi is the image-space numerical aperture of the lens, and |m| is the absolute ...
Finite field - Wikipedia, the free encyclopedia In algebra, a finite field or Galois field (so named in honor of Évariste Galois) is a field that contains a finite number of elements, called its order (the size of the underlying set). As with any field, a finite field is a set on which the operations o
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Depth of field - Wikipedia, the free encyclopedia 10 DOF formulas. 10.1 Hyperfocal distance; 10.2 Moderate-to-large distances; 10.3 Close-up; 10.4 Focus and f-number ...
Exposure value - Wikipedia, the free encyclopedia The f-number (relative aperture) determines the depth of field, and the shutter speed (exposure time) ..... The equation for correcting for ISO speed is sometimes shown with a minus sign, and an online ...
