Hopes this helps, found the information on the filters.

http://athena.cornell.edu/pdf/tb_pancam.pdf

The Near UV filter is a Short Pass filter (IE It's limeted to that specific wavelength). The Near IR one has a 20nm Bands pass (so a 740 to 760nm bandpass) which would not have much real red light to it. Visable Red is at 670nm.

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