My scanned PDFs without OCR are very readable. "Standard" sized paperbacks (roughly 4 1/4" x 6 7/8" are reasonably easy to read on the 6" Astak I have. I can read larger books (which results in finer print) but that's pushing the limit on my old eyes (I wear trifocals as it is). A 6" reader with persistant zoom would probably work well as would a 9". For now, I'm too cheap to pay for them until the price comes down (I would prefer to be able to stay with a 6" if possible; they are more purse friendly). On my 24" computer monitor from 2' or my 32" TV screen from 10', reading with Adobe is a breeze since I can zoom it to a comfortable size.
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