Sigma EM-140 DG Macro Flash
Another flash unit that is great for macro photography is the Sigma EM-140 DG. Aimed at macro, medical and scientific photographers, the Sigma EM 140 DG offers dual flash tubes that can be fired simultaneously or separately. Using only one flashtube creates shadow, which can give a three-dimensional feeling to the subject. A Modelling Flash function makes it possible to check for reflections and shadows before actually taking the flash picture. High Speed Synchro and Exposure compensation functions are also available for advanced flash photography.