hi JúlioBR,
I am not in Brazil, but I will give you my opinion:
When you are doing the Photofocus you actually look behind the book and much further. So it is ok when the words are unfocused, because the thing you are focusing lies behind the book.
When I see the BlibPage the words are also unfocused, but I think this doesn't matter.
In the fith chapter of the PR-book, Paul scheele talks about this, too.
I hope my comment will help you.