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UltravioletPhotography

So, what does that Bayer filter really cost?


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I read somewhere recently that the Bayer filter over the sensor typically absorbs 2/3rds of the incident light. This makes sense if the photons are in the wavelengths antithetical to the dye. So, if the light is green and the cel green, the R and B don't make it through to the sensor. That is, however, a loss that the human eye, for example, doesn't experience. Here is the normalized absorption spectra of a trout's retina (sorry, didn't have time to dig out a human's):

 

http://overmywaders.com/images/4graphs.jpg

 

As you can see, a photon at 390 nm striking a trout's Red cone will be absorbed by the opsin slightly less than the Green and the Blue - which appear equal at that point. However, no matter the cone type, the 390 nm will be absorbed by, and activate, the opsin of that cone. [Even better with the rods.]

 

What does the absorption spectra for the Bayer filter look like? Do we get the same benefit from RGB at 390 nm as in the graph above?

 

Sorry if this is a stupid question. I'm not fully caffinated yet but curious nevertheless. :)

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