The Polaroid Macro LED Ring Flash for Canon is a ring light that can be attached to a Canon hot shoe and macro lenses with filter threads between 52mm and 77mm (7 adapters are included for mounting the light to a lens). A ring light provides virtually shadowless lighting--ideal for macro photography like medical, dental, industrial and creative applications where the situation demands close-up, detailed, well-lit images. The power pack attaches to the camera hot shoe to synchronize the light. This ring light has 32 LEDs--you can choose to use 16 or 32 LEDs for control over exposure. This light can also operate as a continuous light instead of a flash, for shooting video. The power pack operates on 4x AA batteries. Batteries are not included.
Please note, this is a non-TTL manual-only device. There is no auto exposure mode available.