Re: [photo-3d] Digest Number 65

[Ron Beck <rbeck@xxxxxxxx>]

Oliver (and all),
I understand why such sophisticated equipment is needed.  It's the same
reason we paid an extra $8000.00 for a computer rack; it's sexy! :-) :-)

That's right!  Anyone can use their TV set as you mention and use it to
measure the time lag.  But, it's so much more "cool" to construct some
circuitry, attach it to an oscilloscope and look at wave patterns as you
fire both shutters.  In fact, I think we moved an oscilloscope getting
ready for our new computer rack!  Now, all I have to do is run down to
Radio Shack for a few parts....

Regards,
Ron

[HL=9.5 (for the humor impaired)]

Olivier Cahen wrote:
> 
>         Hello. I do not understand why you need such a sophisticated equipment.
> I already answered this question in a short response to Allan Griffin in
> the last December issue of "Stereoscopy", you could easily find it even
> if you are not yet a member of the ISU.
>         Allan talked about using a professional oscilloscope, and did not know
> how to find one and how to use it.
>         Simply use your home oscilloscope, I mean your TV set, take a picture
> of the same TV image with your two cameras, you will esaily measure the
> difference of exposure times and the time lag between your camera
> shutters, with a precision better than a milliseconds. No need to
> understand electronic circuitry for that.
>         If you subscribe to the ISU, you will find more and more simple
> technical information in the next issues of "Stereoscopy".
> 
> Brian Reynolds, in Photo-3d@xxxxxxxxxxx, Digest 65, message 11, wrote :
> >
> > That's more a circuit problem than an oscilloscope problem.  You need
> > to design the circuit so that you can tell which photo transistor is
> > on without needing mutilple inputs on hte oscilloscope.  One way to do
> > this is by adding resistors to the circuit as a voltage divider.
> >
> > Radio Shack has a series of very useful circuit booklets written by
> > Forest Mims III.  They're fairly small and printed on graph paper.
> > There is probably one on using light sensors that would have a useful
> > circuit.
> >
> 
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