B00064XR6Y Sigma EM-140 DG Macro Ring Flash for Canon SLR Cameras

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Fully dedicated with the latest TTL auto exposure systems
Flash tubes can be switched on or off for creative flash control
Wireless flash control; high-speed synchro flash
Guide number of 14
Ideal for close-up photography, especially medical and scientific applications.55mm and 62mm adapter rings are included with the flash