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RE: Re: Re: turning wheels and helicopter blades

	This is common  when viewing something under fluorescent lights,
which flicker at 120Hz.  Incandescent lights flicker less so, and daylight
won't produce this phenomenon at all.

Hans Lehmann

> -----Original Message-----
	> And how do you explain that when you look at turning wheels or
blades with
	> YOUR EYES, you can also see the same effect ? (Yes, live, not a
	> picture)
	> Where is the shutter ?
	> Chris.

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