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Date: Fri, 27 Oct 95 16:46 CDT
From: [e-mail] (John Crookshank)
To: [e-mail]
Subject: Re: GLOW and FIELD RENDERING QUESTION
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On 27-Oct-95 11:01:15, Robert Cohen ([e-mail]) Emailed:

> On Fri, 27 Oct 1995, Brian Dady wrote:

> In editing video which was recorded with two camera, I often rely upon
> the flash of a camera to "syncronize" the camera two footage since we
> don't use time code.  In many cases, a flash can be seen while viewing
> in  real time, but cannot be found when single framing through the
> footage to  set my 0 point.  The reason you cannot see these frames is
> that they  happened in between frames and that the last field or the
> first frame  captured the flash with the first frame of the second
> field.  When you  single frame with a VCR, you are viewing only matched
> frames (the two  fields which comprise that one frame).  I would be at a
> loss if I had to  tell you exactly how long in duration that a
> photographers strobe is, but  I would guess that is is faster than 1/30
> of a second.

Most camera strobe flashes put out a constant amount of light. When the
"auto" sensor on the strobe unit (or the camera sensor if it's
camera-controlled), will limit the DURATION of the strobe to vary the
amount of light for what is required for proper exposure. The intensity
remains constant, they only vary the duration. If your stobe unit has a
sensor on it, covering the sensor will cause the strobe to output for a
longer period, since it will assume you are shooting in near darkness. The
specs on my strobe unit (an ancient Vivitar unit) say it will strobe down
to 1/2000 second. Yeah, in a well-lit room, it would strobe so fast that I
could see how a video camera might even miss it altogether if it fired
during the blanking!

Also, I think you might possibly be mistaken about jogging your VCR while
looking for the flash. Most VCR's only show single fields while jogging, so
if the flash is short enough to be comnpletely recorded in the second
field, it may show during "play" but you might never find it during "jog".

      ______________________________________________________________
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