Bezprzewodowe wyzwalanie lamp

[dr11]

Zasada dzialania bezprzewodowego systemu ETTL Canona fajnie opisana jest tu:
http://photonotes.org/articles/eos-f....html#wireless
Generalnie artykul zawiera duuuzo informacji o blyskotkach Canona.

W http://cpn.canon-europe.com/content/...h.do#container
mamy na str. 2 szczegoly dotyczace medium i protokolu transmisji:

A Speedlite master flash unit communicates with the slave units using visible light (infrared radiation with the Speedlite Transmitter ST-E2).

The information is coded and compressed into a 2 to 5 byte signal. This is transmitted as a 10KHz high-speed pulse.

One advantage of the coded optical pulse is that the slave units will not fire if they receive a single flash from other photographers who are also using flash guns in the same area.