Sigma has announced the EM-140 DG Ring Flash. Targetted at macro, medical and scientific applications the EM-140 DG can be configured to fire both flash rings (left & right) or just one depending on the look. It has a guide number of 14 and is is powered by four AA batteries. From a connectivity point of fview it is compatible with most modern TTL flash protocols including Canon E-TTL, Nikon D-TTL & i-TTL and Pentax P-TTL (as well as Sigma S-TTL).
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Sigma has announced the EM-140 DG Ring Flash. Targetted at macro, medical and scientific applications the EM-140 DG can be configured to fire both flash rings (left & right) or just one depending on the look. It has a guide number of 14 and is is powered by four AA batteries. From a connectivity point of fview it is compatible with most modern TTL flash protocols including Canon E-TTL, Nikon D-TTL & i-TTL and Pentax P-TTL (as well as Sigma S-TTL). 