Sigma F30S16 58mm Macro Flash Adapter Ring
The Sigma F30S16 58mm Macro Flash Adapter Ring allows you to attach the EM-140 DG Ringlight Flash to be mounted on any lens with 58-millimeter filter threads. The EM-140 DG ringlight flash is ideal for close-up photography, especially medical and scientific applications, and is feature rich, with a 46-foot ISO 100 guide number. With the F30S16, you can attach this high-end multi-functional macro flash to compatible digital and 35mm film SLR cameras of all popular manufacturers.