I read both of these books using Safari Books Online by O’Reilly Media.
They are very similar books and both of them are very similar to the owners manual that comes with the Canon 5D Mk III. But they do present the information in a way that is much easier to understand and retain than the manual.
What is missing here is an answer to the question, “Why would I use that setting instead of the other?” You will have to find some other book or better yet books to explain that. Even better, get out there and experiment like crazy. Buy a cheap mannequin off eBay to use as a practice subject and take pictures until your camera stops working.
Canon EOS 5D Mark III by James Johnson
From the publisher:
The Canon EOS 5D Mark III is the latest in Canon’s line of full-frame DSLR cameras. Its impressive array of capabilities and advanced controls allow the photographer ever more influence over the final image. With this comes more menus, buttons, and dials that the photographer must learn how to use to take full advantage of the camera.
This book explores the features and capabilities of the 5D Mark III in a way that far surpasses the user’s manual. It guides readers through the camera features with step-by-step setting adjustments; color illustrations; and detailed how, when, and why explanations for each option. Every button, dial, switch, and menu configuration setting is explored in a user-friendly manner, with suggestions for setup. The informative text is illustrated with screenshots and example images throughout, making it easy to follow along.
Author James Johnson covers everything from the basic features of the camera to the numerous advanced photographic options as he discusses topics such as focus and exposure, lenses, lighting, custom settings, and more. With this book as your guide, you’ll learn how to get the most out of this powerful camera.
Canon EOS 5D Mark III Digital Field Guide by Charlotte K. Lowrie
From the publisher:
Guides readers step-by-step through the functions on their new Canon EOS 5D Mark III
The Canon EOS 5D Mark III features an impressive 22.3 megapixels, a 3.2-inch LCD screen, 6 fps continuous shooting, Live View, an ISO range of 50 to 102,400 and full HD 1080 resolution movie shooting. Here to help you get the most out of these remarkable features?
Offering you more in-depth coverage than the standard manual, this full-color Canon 5D Mark III Digital Field Guide provides you with a better understanding of your camera. Delivering information in an easy-to-understand format, this portable guide features more than 200 inspirational photos by acclaimed photographer and veteran author Charlotte Lowrie. The handy trim size allows this guide to go where you go, allowing you easy access to information quickly so you can get the exact shot you want when you want it.
Helps you make the most of your Canon 5D Mark III and get the shots you want
Offers inspiration with more than 200 lavish photos from the author’s own portfolio
Provides step-by-step explanations on techniques and tips, all aimed at getting you comfortable and confident with your new Canon 5D Mark III
Ideal reading for both amateur and professional photographers alike, you’ll reference Canon 5D Mark III Digital Field Guide again and again.
I rate both of these books a 7 out of 10 and recommend either one of them, no need for both, to anyone who finds the owners manual of the 5D Mk III hard to read.