P3D Re: Pulfrich effect

[boris@xxxxxxxxxxxx (Boris Starosta)]

KENNETH LUKER wrote:
>
>One can see the Pulfrich effect with TWO eyes, too.  Just let your
>eyes become accustomed to the dark (take at least ten minutes in a
...
>the feeling of dragging the lighted circle along by means of a short
>piece of cord tethered to the lighted end of the flashlight.  The
>physics and physiology of the Pulfrich effect become immediately

Now I realize that I have also often seen the Pulfrich effect:  Go out at
night with binoculars, and after becoming accustomed to the dark (to
maximize the effect), take the binoculars to observe a relatively dense
star field.  You want to have both relatively bright and faint stars in the
same field.  When handholding the binoculars, you will get some shake -
what's interesting is that any bright star appears to shake much more, on
top of a field of relatively stable fainter stars.  Thus the bright star
appears dissociated from the firmament, which "lags behind" in its apparent
motion.

Works with either eye.  Funny, how I've been familiar with this for over
two decades, but only just now have come to understand the mechanism behind
it.

Respectfully submitted,

Boris




Boris Starosta

usa 804 979 3930

boris@xxxxxxxxxxxx
http://www.starosta.com
http://www.starosta.com/3dshowcase

"A lifetime can be well spent correcting and improving
one's own faults without bothering about others."
- Edward Weston

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