The only differences between the 505 and 300 is the smaller form factor and the 300 does not have SD/ProDuo card slots
I know the 600 and 900 have zoom and not sure about the 700. Zoom will work for the entire page. If your zoom makes the page larger than will fit on the screen, there are arrows that will pan left/right/up/down to see the parts that do not show on the screen. Also, once you turn a page it will revert back to its original size.
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