The Canon MR-14EX II Macro Ring Light is specially designed to use with Canon macro lenses for close-up photography. It comes with a guide number 34' at ISO 100 per side. The specially made twin tube design helps in firing each flash tube independently or simultaneously. You can also make adjustments to the flash with the help of the illuminated dot-matrix LCD screen. By linking with one or more Speedlite 600EX-RT flashes, it also supports wireless E-TTL auto flash. Loaded with 12 custom functions, this compactly designed ring light also features shorter recycling times making it the most preferred for professional photography.