[photo-3d] Re: Testing synch of twin cameras

[Alan Lewis <3-d@xxxxxxxx>]

Following up on the thread about how to verify the actual synch of twin
camera shutters:

I've had this idea in my head for a couple of years but never got around
to trying it.  This idea is not complete in the details, and may be
flawed in concept, but I think you other guys can expound on it anyway
and make it a workable thing.
If someone else has already stated this idea then as Emily said "Never
Mind..."

I've used the single photo transistor with a battery hooked up to either
an analog or digital scope to check shutter speed.  If both shutters
were checked with this setup and the shutter speeds recorded, then
using  two photo transitors in series and tripping both shutters should
superimpose the two signals, thus your output signal should be the
difference between the two shutters.  

In other words the shorter shutter should have its' signal completely
hidden within the longest shutter's signal, and this would be the best
synch possible with this method.  If the the synch was off then it
should show up in the signal being different than either individual
shutter speed.

After reading this maybe I have it backwards. That's where I need you
other guys to complete the thought.  

If the scope was able to take two signals then the transistors could be
in parallel and the two shutters could be superimposed over each other.

My guess is someone has already done this.
-- 
Alan Lewis  
mailto:3-d@xxxxxxxx
http://members.home.net/3-d
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