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New CLS Preflash Sequence Images

km6xz

St Petersburg, RU
3395 posts

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"RE: New CLS Preflash Sequence Images"

km6xz Moderator Awarded for his in-depth knowledge in various areas, including Portraits and Urban Photography Nikonian since 22nd Jan 2009
Wed 11-Nov-09 02:15 PM | edited Wed 11-Nov-09 04:23 PM by km6xz

Hi Max
You've done some good detective work. The use of a sound card as a digitizing scope made sense, I was going to do that myself as described in last spring. But with a business to run and lots of socializing experiments just sort of got pushed lower on the priority list.
The coding as you displayed is actually a little simpler than I assumed, thinking there would be timing reference pulses.
What is the X axis time scale calibration?
When I built my wireless RF link I used a coil taped to the outside of the flash to read the pulses and just retransmitted them without decoding them. That will still work ok but knowing the signaling it would allow designing a more elegant receiver that mounted inside the remote flash to get access to the optical detector in a mixer that would allow it to respond to either the RF receiver or flash signalling without selecting one or the other. So a mix of units could be used in the same setup.
If someone wanted to package a kit or even have a run made up such a system could be a cheap and better performing alternative to the very expensive PW. The only reason for being so expensive is that it is such a small niche market that no one has bothered to jump into it. The upper limit of what a receiver should retail for would be about $80 and a little less for a transmitter. Due to the extended range, RF channel selection might be needed. Currently the flash link is pretty short ranged so more than one Nikon CLS user at the same event probably do not interfere with each other. Instead of channelized operation, Spread Spectrum all on the same 2.4Ghz band would allow use of low cost MMM's and a logical virtual channel, like WiFi could be used. The band used for data links is one of the only bands that are universal in all the ITU regions and license free.That would mean the RF modules would be so cheap due to their being used in a billion products ranging from wireless headsets to garage door openers.
Good work...
Stan
St Petersburg Russia

Visit my Nikonians gallery.

Pinned topic New CLS Preflash Sequence Images [View all] , HBB Moderator Hal is an expert in several areas, including CLS Awarded for his excellent article contributions to the Resources. , Thu 15-Jan-09 07:25 PM
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