David Busch's "Sony Alpha NEX-5N Guide to Digital Photography" appears (understandably) to be a rehash of his earlier guide on the NEX-5. Unfortunately, though, he has not updated all relevant sections of the book. For example, on page 71 he omits ISO 100 from the list of ISO options. ISO 100 is not an option in NEX-5 but is in the NEX-5N. Again on page 129 he says "The Sony Alpha NEX can use ISO settings from ISO 200 all the way up to the impressive maximum of 12800." This may be the case with the NEX-5, but the NEX-5N also includes ISO 100 and ISO 25600. In fact there is a photo (Figure 4-16) on page 128 that shows ISO 100 on a LCD Live View display!
In the chapter on movie making, he refers on page 181, to an upgrade to firmware version 03 that provides the ability to maintain a fixed aperture. I spent some time searching for this upgrade on the internet only to find it was applicable to the NEX-5 and not the NEX-5N which comes, I've now found, with this feature without needing an upgrade.
On page 243, Busch provides advice on finding firmware updates for the NEX-5 model.
Really!! How could he have been so sloppy with this book?
I am not advocating NOT buying this book because there are few (no?) other books available currently for people wanting more information and hand-holding than the NEX-5N camera manuals provide. However, read it with your NEX-5N camera on hand so you can check the things he says to find out if they are correct.