Re: Shark eyes (was: ???????Question??????

[Ben Kreunen <ben@xxxxxxxxxxxxxxxxxxxxxxx>]

At 10:40 PM 4/2/00 +0100, you wrote:
>On  2 Apr 00 at 13:27, Ruth Thompson wrote:
>
> > You invited questions or comments of any kind on your webpage so as
> > weird as my question is
> > I'll take you up on your offer and ask this:
> >
> > My friend has a pair of those cheap low grade night vision binoculars.
> > After playing around with them for a bit there's something that I just
> > can't grasp when it comes to how they function and I hope you can
> > explain it to me, I'd really appreciate it.  Here's what happened.  I
> > was viewing my friend and his dog,  he was a bit fuzzy looking but I had
> > a difficult time seeing his eyes.  I was able to see his dogs image as
> > being very crisp no glow around him and his eyes were dark until he came
> >
> > close to me then they glowed bright white.  I had my friend take the
> > camera and look at me with the dog.  He became very nervious and said my
> > eyes were also glowing a bright white.  What I don't understand is why
> > through night vision was my friend able to see white from my eyes and
> > I wasn't able to see any color when looking at his eyes.

Take a note of where the light(s) was(were). The effect you see is nothing 
more than light from the same direction as the camera reflecting off the 
back of the eye and into the lens, but because it's really dark you don't 
pay much attention to where it's coming from.   It also only works because 
your pupils are dilated in the dark, so there may be other reasons as to 
why your friends eyes were not dilated  ;-)


Cheers

Ben

=======================================================
Gallery and Photography Tips (including IR)
http://www.bigbenpublishing.com.au/gallery/photography/
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