Anyone who is an avid or professional photographer will tell you that more often than not, they are using their digital SLR camera away from their home or the classroom. And while you may feel like you've got the basics of your camera down, wouldn't it be nice to have some sort of a reference with you when you're on the go? DAVID BUSCH'S COMPACT GUIDE FOR THE NIKON D90 is a portable reference guide that goes beyond the standard field guide. Featuring both the basics - lists of controls, settings, and menu commands - and so much more, including depth-of-field tables, distance charts, and recommended settings for various shooting environments. With this guide on hand you'll be confident in knowing you have all the information you need at your fingertips. Just slip the book into your camera bag and go!