Re: Near IR Visual Observations
- From: Chris L Peterson <clp@xxxxxxxxxxxxxxxxxx>
- Date: Sun, 03 Jun 2007 13:24:20 GMT
On Sun, 03 Jun 2007 05:54:49 -0700, Martin Brown
<|||newspam|||@nezumi.demon.co.uk> wrote:
It seems that the eye has some residual sensitivity to the
unattenuated near IR when the bulk of the visible light has been
filtered out. The visual oberservation of these "false" colour views
is quite interesting. I have tried it with a couple of other people
and they also report seeing red grass and orange trees after adjusting
to the dimness.
It's certainly true that the eye has some sensitivity to near IR. Most
people can see the IR LED in TV remote controls, for instance.
But in this case, it isn't at all obvious to me that you were seeing IR.
Even fully exposed, the film dyes are nowhere near dense enough to
attenuate daylight scenes below your photopic sensitivity threshold. I
think you were just seeing a color distorted world without a significant
IR contribution.
When you look through a true near IR pass filter, everything looks deep
red. You don't see any other color at all.
_________________________________________________
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
.
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