Fallen behind on reading PDML yet again, but wanted
to share a URL I tripped over. Apparently human
eyes _are_ sensitive to near-IR, just not very much
so. This page describes wandring around wearing
welder's goggles with IR filters in them so that
one's eyes get accustomed to the low levels of
light (relative to the retina's sensitivity at
those wavelengths); what the author describes
seeing matches the results of shooting Kodak HIE
with a filter (except for the red tint to everything).
-- Glenn
