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focal length
Sample and examples for "focal length"
| How To Choose the Perfect Lens and Consider #8220;Angle of View#8221;
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| (http://photo.tutsplus.com/tutorials/shooting/...) |
| Many photographers, even some fairly advanced amateurs, misunderstand how to properly employ lenses of different focal lengths. Although selecting a lens isn and #8217;t really a step-by-step process, for purposes of keeping everything organized and showing you how to evaluate a scene, that and #8217;s how it will be presented here. This photography tutorial will explain the reasoning behind choosing a particular lens, and highlight how considering the angle of view can lead to a fantastic photograph. |
| Tags: light perfect angle |
 0 Votes | 50 Views | Photography / | Monday, August 30, 2010 |
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| Close-Up Sharpness
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| (http://www.outdoorphotographer.com/columns/te...) |
| Close-up lenses, when attached to the front of your prime lens, essentially convert the lens to a macro-capable optic, improving close-focusing ability. Their advantage is that they’re smaller in size and less expensive than a prime macro lens. Single-element close-up lenses (diopters) such as you described are designed for use on lenses in midrange focal lengths (35-80mm). They give reasonable results in the center of the image, but generally lose their sharpness at the edges due to their simple optic design. They won’t give good results on your zoom telephoto, as you’ve discovered. Mid-range telephotos require a highly corrected two-element close-up lens such as the Nikon 6T (62mm) or the Canon 500D (77mm), which can be adapted to lenses with smaller filter diameters. Canon also makes a 58mm two-element close-up diopter (the 250D) for use on 38-135mm lenses. |
| Tags: focus macro nikon |
| 0 Votes | 68 Views | Photography / | Tuesday, August 25, 2009 |
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| What is a close-up filter?
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| (http://imaginatorium.org/stuff/cufilter.htm) |
| I'm glad you asked that question. As you know, light consists of photons, which bounce around just like billiard balls, and just like billiard balls, as photons travel they lose energy. In fact, this is what we call the "inverse square law" of light fall-off. (Nobody quite remembers how it got that name, but it's probably to do with an obsolete camera that used a mirror instead of a lens, and took square pictures. Oh, and the image was upside-down in the viewfinder.) It means that each time the photon doubles the distance it has travelled, it loses a measurable quantum of energy. And the new "close-up filters" are sensitive to these quantum levels, and only let through photons fully-charged with energy. That's why they let you take sharp photographs of flowers and insects, while the lower-powered photons from the background turn into a kind of fuzz, or bokeh* as it's technically known. The best of it is, of course, that you can skip all the old-fashioned grey stuff below about "focal lengths" and concentrate on being creative.
Basic lens calculator: 1/u + 1/v = 1/f |
| Tags: level background filter |
| 0 Votes | 53 Views | Photography / | Tuesday, August 25, 2009 |
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| Angle of view of a lens
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| (http://imaginatorium.org/stuff/angle.htm) |
| To use the calculator, either click the 35mm format button, or enter the width and height of the image yourself. Enter the focal length, then click Calculate.
There are no checks on anything as yet. As always, normal people will use millimetres for everything, but it doesn't matter what units you use as long as they're all the same. ("NaN" is Javascript for "Not-a-number", and means someone has done something silly.)calculator |
| Tags: focal length calculator lens |
| 0 Votes | 37 Views | Photography / | Tuesday, August 25, 2009 |
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| India Sojourn: Photographing People
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| (http://www.usa.canon.com/dlc/controller?act=G...) |
| With most good travel situations with people, I will create both wide and tight views of the same subject. In this manner, I will have many choices at editing time! Since I need to work quickly and want to have many options when I get home, I strongly prefer using zoom lenses rather than fixed focal length ones. While visiting Rajasthani homes in India, I often started shooting wide views to include the structures, or crafts that gave a sense of their culture and locale. Then, if the situation was comfortable, I would zoom in more closely. I rarely worked up close to someone, but prefer to work in the 5-10 foot range where people don’t feel cramped nor their personal space intruded upon. |
| Tags: people lenses subject |
| 0 Votes | 49 Views | Photography / | Wednesday, August 12, 2009 |
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| Field of View from EXIF Data
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| (http://www.worldserver.com/turk/quicktimevr/c...) |
| calculator
In the images captured by some digital cameras, there is some data that is useful to determine the field of view for stitching panoramas.
Ideally, this would be the focal length in pixels, but unfortunately the focal length is given in millimeters. In order to determine the field of view, it is necessary to know the density of pixels (in pixels per millimeter) on the virtual imaging sensor associated with the image. Again, this pixel density is usually given in pixels/inch, so conversion to pixels/mm is needed as well. The pixel density may be different for the horizontal and vertical directions. |
| Tags: calculator panorama nd |
| 0 Votes | 27 Views | Photography / | Wednesday, August 12, 2009 |
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photo taken by andrea_pauline
