Dark Water 1000nm with converted Sigma fp.

Started 3 months ago | Discussions thread
D Cox Forum Pro • Posts: 28,993
Re: Dark Water 1000nm with converted Sigma fp.

xpatUSA wrote:

D Cox wrote:

SigmaTog wrote:

D Cox wrote:

Maybe you could photograph CO2.

A container full of dry air, and the same after you drop a lighted match or a small candle in before closing the lid.

Don Cox

I tried this out Don, but I didn't get anything exciting.
Perhaps it is a very narrow band, or I need some more details ?


"Carbon dioxide and water vapor are responsible for energy absorption in the troposphere in this model. Absorption bands of carbon dioxide are centered at 15, 4.3, 2.7, and 2 μm (see Fig. 1).

Ergo, there would be no absorption by CO2 below 2um - thereby making the CO2 transparent in the wavelengths captured by Colin's camera.

So it would need a thermographic camera.  Oh well, it was just a thought.


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