More E-TTL info from Bill

As mentioned in a previous post, Bill Grundmann has been documenting his investigation into Canons protocol.  Bill has just released a PDF summarising what he has found so far.

I’ve yet to go over it in detail, but for those looking at doing some E-TTL investigation of their own this document is a must.

http://billgrundmann.files.wordpress.com/2009/03/ettl_grundmann.pdf

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