It isn't a very hard technique, however doing it correctly, and getting good results out of it can be a little difficult.
For this technique you well need a very bright medium telephoto lens. On standard Digital SLRs a 50mm f/2 combined with the 1.5x frame of view crop will work perfectly. On my m4/3 PEN I used a pentax lens converted to the m4/3 mount in order to get the control I needed.
First thing I did was find a suitable subject. If you need one, look around for clover patches, or shoot grass like I did.
To compress the depth of field (DOF) set the aperture to f/2 anything smaller isn't going to work well. Set the lens focus to its closest setting (On a 50mm lens generally around 1.5 feet) if your lens is a macro set its focus to around 1 foot. Place your camera down on the ground and frame up your subject. On a true SLR you must be using the DOF button to see the depth of field, or use the live view setting.
Your looking for a narrow band of focus to keep only a few blades or blooms in focus. Adjusting the focus a little can help bring the blade of focus into sharper focus, but only adjust a little. Moving the camera back and forth is the best way to make large adjustments.
The low angle will make a line of trees in the background seem like out of focus mountains, and the blades of grass almost like a jungle.
Tips: Pick a subject that isn't to densely packed, shoot at different times of the day, adjust colour in post processing, to add to the effect. The effect works best a lower light try shooting just after dawn or just before dusk when the light isn' t too strong.
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