I purchased this book from Amazon for £12 ($16) and I have to say it's the best £12 I've ever spent. It's really helped me to understand how exposure works, i.e the photographic triangle, creatively correct exposures and so on...
I highly recommend this book to anyone wanting to step out of using Auto Exposure mode and begin to take pictures how YOU want to and now how the camera's sensor tells you to.
So yeah, I'm not plugging this guy's book or anything I just really think others should have the benefits I've had from this book.
http://www.amazon.co.uk/Understandin...8033228&sr=1-1 - UK
http://www.amazon.com/Understanding-...8033228&sr=1-1 - US