Issue is to get lores images at various wavelengths .7-1.8 microns.   
   There are several leds in the NIR, as I remember.   
      
   Are diffraction gratings efficient enough for collecting an image   
   at certain NIR bands near "RT?"   
      
   I heard about IF with a graded thickness (or angled) to get some wl   
   selectivity.   
      
   As well, there are some NIR bandpass filters in the NIR, obviously.   
      
   Finally, the FTIR methods may lend itself to a garbled version of an image.   
      
   Any thoughts welcome.   
      
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