Archived posting to the Leica Users Group, 1998/02/09

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Subject: Re: [Leica] Light boxes
From: Thomas Kachadurian <kach@freeway.net>
Date: Mon, 09 Feb 1998 21:34:56 -0500

Bill and John:

If it is a problem with the flicker you can solve it mostly be including
lots of incandecent light, or better yet daylight around your light table.
Incandecent lights flicker as well but at a different rate which masks the
effect. Try it, it works.

Tom

At 01:06 PM 2/9/98 -0500, you wrote:
>
>
>John_McLeod@designlink.com wrote:
>
>> Dear Doctors of Leica -
>>
>>  When I use this thing for more than about 10 minutes I begin
>> to experience a headache and nausea (no, it's not from the poor quality
of my
>> slides).  I think the problem is either the flickering of the tubes (60
Hz) or
>> the EMF radiation from the transformer, but I'm not sure which it is.
>>
>
>As a commercial pilot I am tested for the problem for you are
experiencing.  It is
>called in pilot jargon "flicker vertigo" and is caused by rapid
oscillations in
>light waves.  Yes, it will cause disorientation, dizziness, and nausea.  I
do not
>know of a cure or a way to avoid the condition.  Some doctors/scientist
say it is
>a mild for of epilepsy.  I am not a doctor and this is my best
guess/observation.
>
>
>