Ageratina altissima 4, White Snakeroot, Howard County, Md, Helen Lowe Metzman

White Snakeroot, Ageratina altissima. Collected and Photographed by Helen Lowe Metzman. Photography Information: Canon Mark II 5D, Zerene Stacker, Stackshot Sled, 65mm Canon MP-E 1-5X macro lens, Twin Macro Flash in Styrofoam Cooler, F5.0, ISO 100, Shutter Speed 200, USGSBIML Photoshopping Technique: Note that we now have added using the burn tool at 50% opacity set to shadows to clean up the halos that bleed into the black background from "hot" color sections of the picture.