The EM-140 DG Electronic Macro Flash is designed to work with both AF 35mm film & Digital SLR cameras of all the popular manufactures. The EM-140 DG Flash is ideal for photographing subjects in fine detail when the shadowless mode is used & is extremely effective for scientific & medical applications. Dual flash tubes can fire simultaneously or separately. Using only one flashtube creates shadow, which can give a three-dimensional feeling to the subject.