Zack Arias. You either like him or you don’t. He is one of the most accomplished professional photographers today and his YouTube videos as well as his http://dedpxl.com/ site are out standing on an education platform.
His style is a bit off the wall but if you get past the style, which I find humorous you will learn a lot no matter what level of photography you are at.
Have a look at his Full Frame Vs Aps Frame lecture. He is right and presents the lecture in his very unusual fashion.
<iframe width=”560″ height=”315″ src=”https://www.youtube.com/embed/PHYidejT3KY” frameborder=”0″ allowfullscreen>