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The Vivitar DF-586 Dedicated Macro Ring Flash for Canon delivers the "shadowless" direct light ideal for macro photography, and it's dedicated to Canon DSLR cameras. it has a (100 ISO) guide number of 18m, full I-TTL dedication for Canon DSLRs, and an exposure confirmation auto check lamp. It delivers app. 150-200 flashes on a battery charge and recycles in 2-3 seconds. The angle of illumination covers lenses 50mm and longer (35mm equivalent) and it's powered by easily found AA alkaline, NiCAd, or Ni-MH batteries. Batteries are not included.