C* Flash protocol

links:

http://billgrundmann.wordpress.com/2009/03/19/canon-ettl-protocol/ http://eosdoc.com/manuals/?q=blankFEL http://eosdoc.com/manuals/?q=EX-M-TTL http://billgrundmann.wordpress.com/2009/03/10/ettl-continued/ http://blog.strobotics.com.au/2009/03/20/canon-e-ttl-timings/ http://kzar.net/wiki/Photo/CanonE-TTLProtocol

http://79.138.40.113/e/fo/ http://79.138.40.113/e/ettl

interesting dates: * ttl - t90 - 1986 * a-ttl - 300tl + ez * e-ttl - eos50 - 1995 * e-ttl2 - 1dmkII - 2004

United States Patent * 5168300 * 5708873 * 6055379

  • 4406533 funny hot-shoe
  • 4423937 8/1981 general TTL meatering
  • 4477171 ttl, 3 pin maybe t-70? funny signaling on aperture pin
  • 4500190 3-pin
  • 4595267 3 pin hot-show, Q seems to also have data, olympus?
  • 4657367 4/1987 auto-mode flash
  • 4760418 9/1986 a-ttl
  • !5809350 8/1996 clk transition as trigger
  • 5839005 exposure integration - 6/1997
  • 6075947 3/1999 e-ttl overview
  • 6094536 6/1996 preflash
  • !6167199 8/1999 bus to wireless
  • 6167202 e-ttl exposure
  • 6349175 e-ttl 2? meatering
  • 6363221 3/2000 similar to 6349175
  • 6404987 550EX, wireless ttl

  • 12/501,393 ttl over wireless

  • D304729 t-80?

  • D296561 T90!