My first attempt at focus stacking from 7 handheld images, hattip: http://www.drkrishi.com/adobe-photoshop-cs4-auto-blending-focus-tutorial. Clearly there is room for improvement. Using my tripod for this kind of projects will be the first step. I also suspect that this particular image streches the potential of Photoshop (CS4), due to the very fine detail and low contrast in the greens.