Focal length — is the distance between the rear focal point of the lens and the back focus of the optical system.
As you can see, academic definition, from the point of view of the common man, somewhat confused. Therefore, an Amateur photographer is not as important to know the definition of such are certainly important features, like lens focal length, how much to imagine what this feature does. And it affects the zoom of the object in the viewfinder/on the screen/in the picture, and in the future.
There are lenses with a variable focal length ("zoom lenses") and lenses with a fixed focal length ("fixes"). The "Zuma" are divided into zoom lenses and aryabhatta. Zoom lenses, typically used in cameras with interchangeable lens, as well as "pseudosecular" (cameras, the principle of focus which are similar to standard compact cameras, but the controls and appearance to match the SLR cameras). The optical scheme of these lenses is that gives you the opportunity to focus on all the focal range declared by the manufacturer for this device. Aryabhattai this useful property does not have and let the owner shoot only on some defined set of focal lengths. While they are smaller, easier and cheaper than zoom lenses. But most users of these "glasses" are not even aware of such limitation. Almost all of "soap" lower and middle price range are equipped exactly aryabhattai.
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The Focal length of the lens, usually either being present in its name (for interchangeable lens), or small numbers and letters just printed on it (typical for CD players). In the latter case, it is very important not to get trapped, because some manufacturers specify only the effective focal length of the lens, some — just real, and some — both. After the appearance of digital cameras in everyday life of photographers entered such concept, as "crop factor". This attitude of linear sizes of a matrix camera to a linear size of a standard uskorennogo frame (36 mm x 24 mm). All matrices are citraconate "chronotime", i.e. their size is much smaller the above-mentioned linear parameters of the film. Therefore, to determine the so-called effective focal length (such as if you shoot normal oskoplennyh with a digital camera), you need a real focal length of the lens multiplied by the crop factor of the matrix. Sometimes this parameter is called the focal length in 35-millimeter equivalent. The matrix size of a simple camera, you can check the documentation that comes with the camera, or on the manufacturer's website. Most likely, the size will look strange, something like that — 1/2,5". Further, in the Internet you can find tables specify the crop factor for the most common formats of matrices.
Largest focal length (usually real, not effective) lenses are divided into the following categories:
Of Course, this division lenses largest focal length is very conditional, but when selecting the optics for the camera, even an Amateur photographer needs to take into account what he plans to do with this "glass".
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Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."
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