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Subject: " RE: New CLS Preflash Sequence Images" Previous topic | Next topic
km6xz Moderator Awarded for his in-depth knowledge in various areas, including Portraits and Urban Photography Nikonian since 22nd Jan 2009Wed 25-Mar-09 04:32 PM
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#44. " RE: New CLS Preflash Sequence Images"
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St Petersburg, RU
          

Hi Hal
That is quite a project and sounds really interesting.

Since you have been here and for a couple days, was it possibly on a cruise ship? Most of the 190 major cruise ship port calls in the summer come for 2 or 3 days. If it was a cruise ship we may have met without knowing it. I am in the business of providing tours for cruise ship passengers who arrive each summer by the hundreds of thousands...quite a change from my long career in the music recording industry.

I moved here 6 years ago and seldom go back to my house in Marin County, just north from San Francisco, 3 times in 6 years. I have a ton, literally, we weighed it thinking I could ship it over here, of test gear, mostly HP, Tek, Motorola, Sound Technology, and much more sitting in a storage unit in California. I've brought over what I can fit in my suitcases each time I've returned, leaving out any clothes.

One thing you could really use in exploring the CLS light pulse train is an Arbatrary Waveform Generator. When you think you are close, program the generator to create the same pattern and test it in a reproducible convenient way. To bad I won't be back for months because I could get one out of storage and loan it to you.

Do you think there is a modulation scheme that involved amplitude? One post mentioned that, but I would bet against it in such a noisy path with so many reflections and ghost paths. It would be hard to tell until finer looks are seen into a single burst to see what it is made of. My hunch is that it is a simple pulse position coding without getting too fancy. There is not that much data to send and it is not that fast of a data rate.
Next time I have access to some more of my gear I will try to dissect a burst to see what is inside the envelope you displayed so well in the photos. I am amazed that hand panning could have such a constant interval between events, that must have taken a lot of practice or you just have a steady hand.
A local community college or university might have an electronics club that has donated gear from manufacturers. That might be a source of enthusiastic helpers who just happen to have DSO and Arb Generator needed to inspect the pulses and then test the theory by controlling the slaves with a programmed coding of what you find using the ArbGen. If that code was data stream secret was broken, there could be lots of DIY projects that could take the lighting system to the next level. Maybe doing the adjustments as discussed for multiple light sources on the target, or repeaters or computer control of the whole works for specialized requirements just like what you are working with now. It would also allow same channel individual control of any number of flashes using RF spread spectrum techniques that would open up all sorts of possibilities.

All very interesting.....
Good luck with your sequenced shot project...

Stan
St Petersburg Russia

Visit my Nikonians gallery.

  

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Pinned topicNew CLS Preflash Sequence Images [View all] , HBB Moderator, Thu 15-Jan-09 07:25 PM
 
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dgillilan Silver Member
29th Jan 2009
1
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HBB Moderator
29th Jan 2009
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dgillilan Silver Member
29th Jan 2009
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bclaff Silver Member
03rd Feb 2009
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HBB Moderator
03rd Feb 2009
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bclaff Silver Member
03rd Feb 2009
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nrothschild Silver Member
04th Feb 2009
7
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HBB Moderator
04th Feb 2009
8
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jtzim
06th Feb 2009
9
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HBB Moderator
06th Feb 2009
10
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Arkayem Moderator
15th Feb 2009
11
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bclaff Silver Member
15th Feb 2009
12
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Arkayem Moderator
15th Feb 2009
13
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bclaff Silver Member
15th Feb 2009
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Arkayem Moderator
15th Feb 2009
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caprae
17th Feb 2009
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HBB Moderator
18th Feb 2009
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nightcat
18th Feb 2009
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Arkayem Moderator
18th Feb 2009
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HBB Moderator
18th Feb 2009
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bclaff Silver Member
18th Feb 2009
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HBB Moderator
18th Feb 2009
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Lakeesh
10th Aug 2009
46
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HBB Moderator
11th Aug 2009
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john barlow
24th Feb 2009
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bclaff Silver Member
24th Feb 2009
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john barlow
24th Feb 2009
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24th Feb 2009
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jrp Administrator
25th Feb 2009
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HBB Moderator
25th Feb 2009
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john barlow
25th Feb 2009
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HBB Moderator
25th Feb 2009
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john barlow
25th Feb 2009
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HBB Moderator
25th Feb 2009
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nl
26th Feb 2009
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PAStime Silver Member
06th Mar 2009
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HBB Moderator
06th Mar 2009
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ScottChapin Moderator
09th Mar 2009
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Arkayem Moderator
09th Mar 2009
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09th Mar 2009
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09th Mar 2009
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km6xz Moderator
25th Mar 2009
42
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HBB Moderator
25th Mar 2009
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km6xz Moderator
25th Mar 2009
44
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HBB Moderator
25th Mar 2009
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picmax
04th Nov 2009
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picmax
11th Nov 2009
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km6xz Moderator
11th Nov 2009
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picmax
11th Nov 2009
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11th Nov 2009
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11th Nov 2009
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11th Nov 2009
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Arkayem Moderator
11th Nov 2009
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picmax
15th Nov 2009
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15th Nov 2009
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picmax
16th Nov 2009
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picmax
16th Nov 2009
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Arkayem Moderator
16th Nov 2009
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picmax
16th Nov 2009
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16th Nov 2009
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gkaiseril Gold Member
16th Nov 2009
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Arkayem Moderator
16th Nov 2009
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gkaiseril Gold Member
16th Nov 2009
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picmax
17th Nov 2009
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picmax
17th Nov 2009
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16th Nov 2009
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16th Nov 2009
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picmax
17th Nov 2009
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picmax
17th Nov 2009
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km6xz Moderator
17th Nov 2009
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17th Nov 2009
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gkaiseril Gold Member
17th Nov 2009
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picmax
17th Nov 2009
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Arkayem Moderator
16th Nov 2009
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dondiego
28th Dec 2009
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29th Dec 2009
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dcayers Silver Member
22nd Feb 2010
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26th Feb 2010
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ctadin Silver Member
27th Feb 2010
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02nd Mar 2010
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15th Mar 2010
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15th Mar 2010
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jhanes55 Silver Member
16th Mar 2010
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henryga
03rd Apr 2010
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picmax
03rd Apr 2010
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HBB Moderator
05th Apr 2010
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selectivecolour
01st May 2010
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picmax
01st May 2010
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selectivecolour
03rd May 2010
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gkaiseril Gold Member
13th May 2010
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selectivecolour
14th May 2010
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19th Nov 2011
97
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21st Nov 2011
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