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calculator
Sample and examples for "calculator"
| Focussing distance?
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| (http://imaginatorium.org/stuff/focus.htm) |
| To use the calculator, enter the lower distance mark in the left box, and the further distance mark in the right box, then enter the relative position as a proportion of the way from the nearer mark to the further one. For infinity, click the button. (You can enter "Infinity", but it must have a capital 'I') This works for any units (metres, feet, parsecs, or ells), as long as both marks are on the same scale. I don't check anything, so if you enter a proportion outside the range 0 to 1, you can extrapolate as well as interpolating, but see below for how reliable this is. "NaN" is Javascript for "Not-a-number", and means someone has done something silly. |
| Tags: focus calculator how to |
 0 Votes | 37 Views | Photography / | Tuesday, August 25, 2009 |
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| How many stops?
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| (http://imaginatorium.org/stuff/stops.htm) |
| Calculate the number of stops difference between two exposure settings - enter the values in the upper and lower marked boxes. You can compare complete exposure settings of aperture and shutter speed, or shutter speed or aperture separately. (But obviously, if you fill in one aperture (for example), you have to fill in the other one as well, or the ratio can't be calculated.)
calculator |
| Tags: exposure shutter shutter speed |
| 0 Votes | 25 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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| 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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