Sigma has released a new macro flash for Sony DSLRs, the EM-140 DG, a fully dedicated TTL flash ideal for close-up photography in medical and scientific applications where you need to capture fine details in shadowless mode.
Its dual flash tubes can fire simultaneously or separately. Using only one flashtube creates modeling, which can give a three-dimensional feeling to the subject. The flash features a guide number of 14 w/ISO 100.
The Modeling Flash function makes it possible to check for reflections and shadows before actually taking the flash picture. A wireless flash function is also available, where the EM-140 DG is used as master and the EF-530 DG SUPER as a slave unit for creating fine shadow details.
The EM-140 DG is also available for Sigma, Canon and Nikon cameras.