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Everybody knows that Stumbleupon is an great source for beautiful photography, nature, pets, arts and much more. They have millions of users and they are probably the most wide used source for finding quality content.
Top 20 Earth Pictures found on Stumble Upon | Earth Pictures
Depth of Field Depth of Field (DOF) is the front-to-back zone of a photograph in which the image is razor sharp. As soon as an object (person, thing) falls out of this range, it begins to lose focus at an accelerating degree the farther out of the zone it falls; e.g. closer to the lens or deeper into the background. With any DOF zone, there is a Point of Optimum focus in which the object is most sharp.

