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Posted by George Hammond on 10/12/05 18:18
On Wed, 12 Oct 2005 08:12:34 -0700, "odin" <ragnarok@yahoo.com> wrote:
>> they won't see any "stuff" unless the strobe flash is longer than 1/15
>> of a second for adults.... in fact LONGER flashes are needed fo
>> kids... more like 1/10 of a second.
>
>OK. Read the wikipedia article on Xenon flash lamp. It contains the
>following information: "Discharge durations for common flashlamps are in the
>microsecond to a few milliseconds range and can have repetition rates of
>hundreds of hertz." Xenon flash lamps are used in all sorts of applications
>where a strobe light effect is needed. My dad used them to photograph insect
>behavior without cooking them. So You should be able to do your experiment
>without all the messy video stuff. Just test to see if kids and adults are
>able to see different things in a dark room while changing the flash rate
>and the flash duration of a Xenon flash lamp strobe light. I think that you
>will find that your theory does not hold up. But even if it did, how would
>that prove anything about god?
[Hammond]
That is one hell of a good idea!
There may be a problem with it however.... due to ther fact that the
light is so bright especially when flashed in a dark room. Intense
light causes "afterimage effects" which may interfere.... however...
you could put a lampshade over the flashlamp... or wear sunglasses
or something.
Some guy already mentioned that he opened up his 35 mm camera, which
has a variable speed shutter (.1 sec, .05 sec, .001 sec, ......etc).
Of course there you have the same problem of a brght flash in a dark
room also.
This is why measuring the PFF (picture fusion frequency) of the person
is so ideal.... it doesn't involve any of these "eye problems" that
flash lamps do.... all you need is a film projector with a variable
speed motor.
Anyway.... thanks for the idea.... if I had either a flashlamp or a 35
mm camera you can be sure I'd be testing people (especially kids under
7 vs. adults) right now.
By the way... they must have tested thousands of adults using flash
lamps.... problem is... they probably never bothered to test kids.
Fact is Riedel (1966) seems to be one of the few to test kids, and HE
was the one who first discovered the PFF increases linearly with age
in kids under 18. And still, nobody seems to know about it except me
and a few obscure research scientists like Siegfried Lehrl in Nurnberg
who I am in contact with.
You're a smart cookie Odin... thanks for the suggestion..
By the way, I just thought of another thing.... you know how those
Wagon wheels go backwards in western movies because of the strobe
effect of the movie film..... I'll bet you can run a film at a certain
rate (variable speed projector) where a kid would see the wheels
rotate one way, and adults would see them rotate the opposite way!
anyway.... nice talking to you.... you got me thinking...
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