jwms Hatchling 5 posts Joined Oct 2010 Location: Seattle area More info | Oct 23, 2010 17:48 | #1 Just got a Canon SX20 IS. And new to the forum. I am looking for information about the hot shoe connector functions, voltage levels, etc. Getting back into photography after some 25 years and there is a lot more functionality now and I do like to tinker and do mods when needed. Any help is appreciated.
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Wilt Reader's Digest Condensed version of War and Peace [POTN Vol 1]  More info | Oct 23, 2010 23:41 | #2 Not public information, it has to be reverse engineered. Flash manufacturers that make third party products compatible with Canon dSLR had to do their own reverse engineering. You are not simply dealing with voltage, as there is data sent from body to camera (most likely serial data) about lens FL and aperture, as well as commands to emit preflash or focus pulse, and partial output commands for ETTL control of flash. You need to give me OK to edit your image and repost! Keep POTN alive and well with member support https://photography-on-the.net/forum/donate.php
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