Also PDF is just a container. It can contain a sort of postscript, OCR text for searching and a scanned image for reading. It's not meant to reflow, but preview printing. So conversion to ANY ebook format will often be poor to rubbish, depending on what is in a PDF.
You need to view PDFs as PDFs, on something large enough to read fine print on Letter or A4 source without panning or zooming. Older 1200 line LCDs were better than newer 1080 so called "full HD" laptops. Tablets need to be decent DPI and used in Portrait and at LEAST 10", larger may be needed if the screen is longer aspect ratio
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