Today’s image of shafts of sunlight cutting through tall redwoods along a Muir Woods hiking trail comes from vgm8383’s photostream. This is an HDR (high dynamic range) photo — a technique that combines multiple exposures to give a greater range of tonal detail. It worked pretty well in this instance because Muir Woods is surprisingly dark (test it with a light meter if you don’t believe me), and the light is very green.