[photo-3d] Re: 3D Camera Synchronisation

["Robert Brand" <rb@xxxxxxxxxx>]

Boris, you asked about my twin rig Ricohs and the method of wiring the sync.
I bought a pair of KR10M cameras about 8 years ago and doctored them up. I
did choose them using a method to ensure good initial sync. I will be
writing a detailed article for the Sydney Stereo Camera Club magazine
shortly, but there was a fairly detailed article I wrote some years ago. I
will scan the old magazine in the next few weeks and put it in the archives
on the sscc web site. I will post a note here for those that are interested.
The new article will be available for members, but maybe reprinted in other
club magazines at a later date.

You also said: "This would also permit much more reliable performance with
flash
synchronization in the studio (where you actually want the cameras to be
non-perfectly synched, with the flash signal coming off the slower camera).
Please let us know the circuitry needed to effect a delay feature.  For
flash synch I am looking for a camera delay of around 1/100 sec."

The design is in my head at the moment, but it will not take much to turn it
into reality. I plan to use 4 thumb wheel switches to allow delay in one
second intivals. I will use an accurate 1kHz oscillator to derive a 1m sec
pulse and use the thumb wheel settings to dial up the number of pulses I
need before firing the second camera. Thus I will have 1m sec - 10 sec in 1m
sec intervals.

This will also allow those interested in spacial effects to have accurate
control over the timing between shutters. If I build in an adjustable
offset, it can be used to set the cameras to fire accurately together if one
camera is normally a bit slower than the other (with the adjustable delay
set at all zeros) The offset will be a simple binary DIP switch inside the
unit and once set should not need to be adjusted. It will run off the camera
batteries. A preset could be included for flash work to delay the fastest
camera, but if the sync is accurate, this should not be necessary. It could
be used for a variety of cameras.


 

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