Canon provide an excellent and authoritive manual for this camera, so it was not obvious why you would want another source of info.
I think this book is a bit more readable, and less experienced photographers would welcome browsing through this to get an outline view of the facilities, and then perhaps refer to the Canon manual to confirm the detail. It is also very useful to have another book around the house - in the dining room or loo, perhaps? I guess I am not the only one who oftens misfiles a manual and waste time trying to find it - in most cases this book would have answered my question easily.
So whilst not essential, if you are a keen user, well worth having this around.
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