The O flash turns your ordinary speedlight flash into an extraordinary ring flash. Great for portraits with impact and macro photography. The subject is lit from all directions yet the final image has great contrast thanks to the unique properties of a ring flash - no washed out, flat looking images!
In most cases TTL is retained so everything works in full auto making exposure a breeze
The gap in the top is designed to allow the focus assist function present on many flashes to work correctly, most other designs block the focus assist lamp.