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Infrared with the M system

Started 8 months ago | Discussions thread
Fedia Le Grill
Fedia Le Grill New Member • Posts: 12
Re: Is the color infrared swap just 'art' - is there a good reason for it?

Wow if this graph is true I want a canon 350D immediatly :

https://www.researchgate.net/figure/Spectral-sensitivity-of-unfiltered-Canon-350D-sensor_fig1_229046541

the peaks in red first, then green, then blue seem distinct enough to produce a real three-color image only with the 700 to 1000nm IR spectrum !

The thing is I have a canon 1000D full spectrum (wich is only 3 years more recent than the 350D, it has a different sensor though...) and I never noticed that they were any color variation in the tones it produced when I use it with a 720nm filter....

Does it mean that the that objects reflecting IR refelect all IR wavelengths the same way ? That it is impossible to extract Three primaries like for exemple 700nm, 800nm and 900nm since all those wavelengths are reflected the same way ?

I did notice though that when I use a 720nm filter on the camera and I add a GRB3 filter that cut the longer IR wavenlegths the image color slide towards Red. I suppose that If I added a 850nm filter that cut the shorter IR wavelength the image color would slide toward Blue or deep violet. I dont have this filter just now, but I ordered it.

 Fedia Le Grill's gear list:Fedia Le Grill's gear list
Sigma DP1s Canon EOS 1000D Canon EOS 600D Canon EOS 1200D Canon EF 50mm F1.8 II +3 more
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