What we found on the web about Focal Length
The focal length of an optical system is a measure of how strongly it converges (focuses) or diverges (defocuses) light. For an optical system in air, it is the distance over which ...
The focal length controls the field of view of the instrument and the scale of the image that is presented at the focal plane to an eyepiece, film plate, or CCD.
Computer Modules, kowa, calculate focal length, microscope basics, navitar, navitar lenses, lens selction. camera lenses, CCD lens chart, lens calculator, lens calculations ...
Distance from the centre of a lens or curved mirror to the focal point. For a concave mirror or convex lens, it is the distance at which rays of light parallel to the principal ...
Whether it's a dramatic close-up or a stunning wildlife shot from a 100 yards away, focal length will determine if you get the shot you want. See below to see just what a ...
Tokyo, Japan, Nov 22, 2006 - (JCN) - Fujinon Corporation, a subsidiary of Fuji Film Corporation announced its release of DIGI POWER 88, HD zoom lens with a focal length of 8.
The focal length controls the field of view of the instrument and the scale of the image that is presented at the focal plane to an eyepiece, film plate, or CCD.
focal length. n. Abbr. f. The distance from the surface of a lens or mirror to its focal point. Also called focal distance, focus. focal length, distance
length (l) (length) the longest dimension of an object, or of the measurement between the two ends. crown-heel length (CHL) the distance from the crown of the head to the heel in ...
The web's most comprehensive site devoted to the art of landscape and nature photography using traditional as well as digital image processing techniques.
Resources and Tutorials for Amateur Astronomers by Jeff DeTray, Astronomy Boy. CG-5 mount improvements, barn door tracker, constellation portraits, SAA 100, animated equatorial ...
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The focal length of an optical system is a measure of how strongly it converges (focuses) or diverges (defocuses) light. For an optical system in air, it is the distance over which initially collimated rays are brought to a focus. A system with a shorter focal length has greater optical power than one with a long focal length; that is, it bends the rays more strongly, bringing them to a focus in a shorter distance.

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These recent articles mention Focal Length
Sunday Observer
Keerthiratna of Vidyartha College Kandy, who secured the second place for his invention of "Instrument to Measure Focal Length" and also presented a bronze medal, a certificate and Rs. 10,000 cash award to A. M. K. J. Layanal of Sumana Bali...
PC Magazine
Both cameras will be sold with two lens options, either a 3X optical zoom lens (14-45mm, f/3.5-f/5.6) or a fixed focal length lens (17mm, f/2.8.) Pricing will only vary based on which camera you buy, not based on the lens. Unlike the E-P1's...
engadget
Google has made some pretty major changes to the camera application in Android 2.0 (including more control over white balance, focal length, flash settings, and effects), and Motorola has smartly outfitted the DROID with a 5 megapixel camer...
Studio Daily
The camera metadata gave us frame-by-frame information on the convergence distance, the separation between the two cameras, as well as the focal length and the f-stop settings.” The "Thriller" sequence also includes a visualization of Vince...
Popular Science
Schmidt-Cassegrains use a combination of mirrors and lenses to cram a lot of focal length and aperture into a compact tube. And the more aperture you have, the more light, and detail, you can bring in.) I'm able to align the motorized mount...
creative loafing
I knew a photographer who swore by the rule "Never use a lens whose focal length, in millimeters, is less than the weight of the woman." Sexist thought? No doubt. Just saying it's a guideline you might want to keep in mind.) If you don't ha...
PhysOrg
The resulting output signal mirrors the original input, but is compressed to the length of the second pump pulse. As Gaeta puts it, the "focal length" of the temporal lens is determined by the length of the pump pulse. As with conventional ...
Tom's Guide
But the field of view uses a 16/9 aspect ratio, and the focal length is a very wide 34.6 mm, with a zoom factor of up to 10x. The image quality is mediocre. In low light, the autofocus has trouble keeping up, and noise quickly invades the i...
New Orleans Times-Picayune
Others have called for more than the planned total of 200 parking spots in three areas along the length of the park ... The new park will have two focal points of activity: the Mandeville Street and Piety Street wharves, connected by a narr...