Re: [photo-3d] Re: Realist and Flash

[ka2hsu@xxxxxxxx]

George

The flash fires only at 1/25s with either bulbs or electronic flash at
shutter speeds. I have been using an electronic flash for years and it
gives me good results, provided I have the shutter speed set for 1/25s.
Tydings includes an "Electronic Flash Guide-1/25 Only" table for the
Guide Numbers ranging from 19 to 52 for flash watt-second ratings from 50
to 400. He emphasizes at all points that  the camera will permit flash of
any kind, bulb or electronic, to fire only with a setting of  1/25th
second and that has been my experience with both types of flash.

What you are describing must have been a modification in later models in
order to enable firing at all shutter speeds. I wish mine would work that
way.

Rogers

On Sat, 26 Aug 2000 13:34:36 -0400 "Dr. George A. Themelis"
<drt-3d@xxxxxxx> writes:
> Well, a number of issues are involved here...
> 
> >The flash will only work at a shutter speed of 1/25s on my camera. I
> >observed this when I was first using my camera with flash bulbs in
1953.
> >The flash would not fire at any other shutter speed setting. 
> 
> That's a problem.  The camera should fire any flash at
> any speed.  When you click the shutter, a contact is
> made and the flash unit is shorted.  This action fires
> the flash.  This happens at ANY speed.  The issue is if
> the shutter remains open when the flash gives its full
> output or not (synchronization).  In other words, the flash 
> should always fire.  Whether it is in synch with your shutter
> and you see the light in the pictures is another issue.
> 
> So, hardware problem to start.
> 
> Second problem/issue:  Are you trying to use electronic flash
> today or are you still firing flash bulbs?
> 
> >I first read
> >about this in the pamphlet "The Stereo-Realist Guide", by Kenneth
> >Tydings, 1952, Chapter 8 - Flash Equipment And Its Use, pages 
> 40-43. He
> >wrote "You must set your shutter at 1/25 second. This is the only 
> shutter
> >speed setting which permits flash synchronization with any flash 
> source."
> 
> This is a correct statement and only applies for flash bulbs,
> not electronic flash.  Flash bulbs are slow in delivering
> their full light output.  You need a slow shutter speed to
> allow sufficient time for the flash bulb light output to
> reach the film.
> 
> Electronic flash has a very short output, delivered almost
> instantaneously.  With electronic flash you should get all
> the light output at any speed with the Realist.
> 
> >Is there some way to modify my camera so that it will synch at any
> >shutter speed?
> 
> Back to my question:  Are you using flash bulbs or electronic
> flash.  If you use electronic flash, have you tried it
> at fast speeds?  If the camera is mechanically OK, the
> electronic flash should work.  This is my understanding.
> 
> George Themelis
> 
> 
>