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UV/IR Thermal or Xray Photography Humans happen to use visible light naturally but now we can go beyond the usual wavelengths we appreciate, to find out more about our world and ourselves.

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Old March 20th, 2012, 01:06 PM
Tom Robbins Tom Robbins is offline
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Default Spring Equinox Sky

Hauled my old Canon 5D with sensor modified to infrared along on an outing to a rural area today around noon (remembered to insert a CF card this time, Ruben). The wavelength has a way of darkening blue sky, which then tends to make any clouds in the sky very apparent. There were few clouds at the time, however, so the resulting sky is almost night-like.


Fenced Pasture

I don't know if the IR darkness of the sky at noon varies with the season, but suspect if it does it would be to a minor extent.
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Old March 20th, 2012, 06:02 PM
Maris Rusis Maris Rusis is offline
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Quote:
Originally Posted by Tom Robbins View Post
Hauled my old Canon 5D with sensor modified to infrared along on an outing to a rural area today around noon (remembered to insert a CF card this time, Ruben). The wavelength has a way of darkening blue sky, which then tends to make any clouds in the sky very apparent. There were few clouds at the time, however, so the resulting sky is almost night-like.


Fenced Pasture

I don't know if the IR darkness of the sky at noon varies with the season, but suspect if it does it would be to a minor extent.
I reckon you are right. The sky would be black if it were not for Rayleigh scattering and Tyndall scattering. Both of these processes are strongly wavelength dependent and short wavelengths, blue for example, are scattered much more than red and infrared. Hence the sky looks blue.

In the infrared the sky is effectively "black" more than a few degrees from the line of the sun.

Incidentally the lack of atmospheric infrared scattering allows the remarkable clarity of distant landscape features in your striking picture.
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Old March 21st, 2012, 11:45 PM
Ruben Alfu Ruben Alfu is offline
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Beautiful landscape Tom, I see the work of man dwarfed by the bushes in the foreground, the celestial sphere, and the pasture itself. I think that's humbling and inspiring.

Regards,

Ruben


P.S. let's make CF stand for "can't forget"
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Old March 22nd, 2012, 04:56 AM
Tom Robbins Tom Robbins is offline
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Maris, thank you for your comments regarding the atmosphere. Quite often conditions overhead either make or break a landscape photo, particularly here in the Midwest US. This is an incentive to learn as much as possible about how it affects available light.

Ruben, thank you for taking a look and sharing your thoughts. Converting one of my 5Ds to infrared was an expensive proposition, so I'll try to exercise its shutter a little more often this year.
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