These are the essentials for any photographer. I want to share these books, because not only are they great in knowledge they are written in a way that anyone can understand them! I bought all of them (you can easily find them on amazon.com, I'll provide you with the links below)
The Digital Photography Book Vol. 1., Vol.2., Vol.3 and Vol. 4!
Scott Kelby, the man who changed the "digital darkroom" forever with his groundbreaking, #1 bestselling, award-winning book The Photoshop Book for Digital Photographers, now tackles the most important side of digital photography--how to take pro-quality shots using the same tricks today's top digital pros use (and it's easier than you'd think).
This entire book is written with a brilliant premise, and here’s how Scott describes it: "If you and I were out on a shoot, and you asked me, 'Hey, how do I get this flower to be in focus, but I want the background out of focus?' I wouldn't stand there and give you a lecture about aperture, exposure, and depth of field. In real life, I'd just say, 'Get out your telephoto lens, set your f/stop to f/2.8, focus on the flower, and fire away.' You d say, 'OK,' and you'd get the shot. That's what this book is all about. A book of you and I shooting, and I answer the questions, give you advice, and share the secrets I've learned just like I would with a friend, without all the technical explanations and without all the techno-photo-speak."
This isn't a book of theory—it isn't full of confusing jargon and detailed concepts: this is a book of which button to push, which setting to use, when to use them, and nearly two hundred of the most closely guarded photographic "tricks of the trade" to get you shooting dramatically better-looking, sharper, more colorful, more professional-looking photos with your digital camera every time you press the shutter button.
Here's another thing that makes this book different: each page covers just one trick, just one single concept that makes your photography better. Every time you turn the page, you'll learn another pro setting, another pro tool, another pro trick to transform your work from snapshots into gallery prints. There's never been a book like it, and if you're tired of taking shots that look "OK," and if you’re tired of looking in photography magazines and thinking, "Why don't my shots look like that?" then this is the book for you.
You could easily get them in their digial versions and put it on your tablet. I personally have dowloaded them through the kindle app on my iPad, and it works like a charm. That way you can really take them with you in the field, and not have to carry lots of books. More on Amazon Kindle Books
How to Shoot Great Photographs with a Film or Digital Camera
For serious amateur photographers who already shoot perfectly focused, accurately exposed images but want to be more creative with a camera, here’s the book to consult. More than seventy techniques, both popular and less-familiar approaches, are covered in detail, including advanced exposure, bounced flash and candlelight, infrared, multiple images, soft-focus effects, unusual vantage points, zooming, and other carefully chosen ways to enhance photographs. The A-Z format make sit easy for readers to find a specific technique, and each one is explained in jargon-free language. Top Tips for each technique help readers achieve superb results, even on the first attempt.