Re: Mysterious Streamers (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Fri, 24 Aug 2007 02:40:37 -0400
From: Dave Pierson <davep@xxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Mysterious Streamers (fwd)


>> At the "Museum of Mysteries" in Seattle, people are always 
>> bringing in these same photos.  But there's no mystery.  The 
>> explanation is simple.
>> Some cameras have a mode where they first fire the xenon 
>> flash, then they leave the shutter open for quite some time 
>> in order to fill in the dim background.   If the camera is
>> handheld, then the photographer often will take these flash
>> pictures, then wave the camera around while the lens is
>> still open.   Any light sources will become "streamers."   

>Then why doesn't the rest of the picture blur similarly?
      Dim things (coil, toroid) are dark, are only captured when flash is on.

>Is the speed of light different from a street light
      No

> (which is not even in the camera's field of view)
      If camera moves, during 1 sec exposure, many things may pass field of
      view.

      best
       dwp
        (50 odd years with camera(s).)