@jekvb did a great job, he used both viewers and zoomed just enough to see the entire page so thanks again

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Now I would like some similar pictures but taken with a DSLR (aperture F9)

. I still think that PB has really gray fonts with both viewers (Adobe, PDFviewer) but to be convinced I need a crystal clean image.
Q2: is it possible to do something to make the fonts darker in PDF and not damaging the formatting (I think this would be equivalent with not using file conversion)

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PS: @jekvb photos are taken with a sony DSC-W120 (for any interested)