Bokeh by Arqball is an interactive e-book for the Apple iPad, designed to teach beginners about zooming, focusing, depth of field and exposure. Each lesson simulates the photographic process on a real scene as you interactively adjust a camera setting. “This book will appeal to enthusiasts who want to learn more of the science behind photography and how modern digital SLR cameras function,” the publisher says. Bokeh for iPad is available on iTunes for $1.99.

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