You may be looking at old posts, billbirchall -- the PRS505 only recently added PDF re-flow to its bag of tricks. Before that, it was stuck with scaling the PDF "page size" down to the 505's 6" screen. That's no big deal if the "page size" is close to 6" diagonal, but if it's sized for Letter/A4 paper (~14" diagonal) then it looks pretty tiny when shrunk to less than half it's original size.
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