Over the weekend, I field-tested the iPad vs. paper book, and added a photo of a similar environment with Kindle (published and photographed by Len Edgerly). As can be seen, only the eReader/Kindle can be read outdoors in daylight, even in shade (click images for full size).
![iPad under shade outdoors](http://www.givoly.com/wp-content/uploads/2010/07/IMG_0627.jpg)
![Kindle outdoors](http://www.givoly.com/wp-content/uploads/2010/07/126936781.jpg)
![Regular book under shade outdoors](http://www.givoly.com/wp-content/uploads/2010/07/IMG_0625.jpg)
As you can easily see, the iPad is unreadable while the Kindle (and the regular book) are perfectly readable. So, if outdoor environment in daylight (or shade) is a requirement, the iPad (and presumably, other tablets) will find it challenging. Screen covers might help – but I haven’t tested those.
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